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post #1 of 31 Old 06-24-2012, 01:21 AM Thread Starter
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Single Exhaust?

So I've been debating hacking the y pipe and just running a 3 inch single pipe to a muffler and dumping it over the axle.

Is this gonna sound like ass or what?


It a 4.6 mod motor with a 67mm single

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post #2 of 31 Old 06-24-2012, 02:37 AM
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Should sound the same. All the exhaust is already brought into one while going through the turbo. I've heard plenty single exhaust cars, liked them all

My f150 has a single exhaust from the turbo and the sound is perfect IMO


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post #3 of 31 Old 06-24-2012, 11:48 PM Thread Starter
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Thanks, thats all I wanted to know.

Going to pick up a 3 inch muffler and just run a single 3 inch pipe.
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post #4 of 31 Old 06-25-2012, 12:30 AM
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have always had single and i think it sounds great have yet to have a need for dual


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post #5 of 31 Old 06-25-2012, 12:38 AM Thread Starter
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Well I'm going to run a mac flow path 3 inch all the way and probably dump it over the axle
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post #6 of 31 Old 06-25-2012, 12:41 AM
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Put a cut out in place of the Y-pipe pipe that you don't use, more power for when you want it, quiet when you don't need it.

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post #7 of 31 Old 06-25-2012, 12:54 AM Thread Starter
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I doubt it would be worth it.....bypassing a single muffler probably won't help.much
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post #8 of 31 Old 06-25-2012, 12:57 PM
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So you want to take two 2 1/2 tailpipes (which is 5 inches of total exhaust pipe) and reduce it down to a 3 inch exhaust? Your going to increase backpressure!

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post #9 of 31 Old 06-25-2012, 01:09 PM
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Originally Posted by mghoward74 View Post
So you want to take two 2 1/2 tailpipes (which is 5 inches of total exhaust pipe) and reduce it down to a 3 inch exhaust? Your going to increase backpressure!
His down pipe is 3" y piped to the stock tailpipes, he wants to remove the y pipe and run 3" all the way from turbo back.

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post #10 of 31 Old 06-25-2012, 01:29 PM Thread Starter
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That is correct, its a 3 inch down pipe out of the turbo and runs back past the transmission and has a y pipe which splits off into the twin 2.5 inch pipes to the mufflers and out the stock tips.

I just want to hack the y pipe and extend the 3 inch diameter pipe through a single 3 inch in.out muffler and dump it over the axle most likely.

I have a few reasons.

1) the y pipe hangs low and scrapes ####
2) weight saving
3) simplicity
4) want to get the passenger tail pipe away from my fuel lines
5) Ive always wanted to have no tail pipes on my sn95 cause I think it looks cleaner

Considering it runs a 3 inch pipe for 75% of the exhaust length I dont see how this would increase back pressure but maybe I am wrong?

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post #11 of 31 Old 06-25-2012, 02:44 PM
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Your Y pipe problem ("Hanging Like ####") more than likely is caused by bad mounts....i.e. engine and trans. Found that out the hard way!

Your other reasons 2 through 5 are valid. On the other hand you have to consider backpressure issues. The minumum for a turbo system is a 3 inch exhaust...which is what you want and will be down sizing to.

I was just wondering why you would to subtract from your build rather than add.

good luck on your build

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post #12 of 31 Old 06-25-2012, 05:52 PM Thread Starter
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As far as scraping, the car is just low...and the way the y pipe is designed the one side drops down lower than the other for some reason and literally scrapes coming out of my driveway.

As far as back pressure, I would think that the only way to decrease backpressure would be to have larger exhaust coming off the turbo?

The exhaust is still going to be 3 inch for 50-75% of the exhaust total length no matter what.

Anyone have any real input on this? Real data?

Its kinda like breathing through a straw.

If you connect a garden hose to a straw your still restricted by the straw correct?

Same concept as connecting 5 inches of pipe to the 3 inch pipe.

I would think the backpressure would be the same or very similar.
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post #13 of 31 Old 06-25-2012, 06:28 PM
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Quote:
Originally Posted by justinschmidt1 View Post
As far as scraping, the car is just low...and the way the y pipe is designed the one side drops down lower than the other for some reason and literally scrapes coming out of my driveway.

As far as back pressure, I would think that the only way to decrease backpressure would be to have larger exhaust coming off the turbo?

The exhaust is still going to be 3 inch for 50-75% of the exhaust total length no matter what.

Anyone have any real input on this? Real data?

Its kinda like breathing through a straw.

If you connect a garden hose to a straw your still restricted by the straw correct?

Same concept as connecting 5 inches of pipe to the 3 inch pipe.

I would think the backpressure would be the same or very similar.
you are correct. if the exhaust is a restriction due to being 3", your not changing that by ditching the dual 2.5" because the exhaust is already a single 3" up stream. youll have no hp change, enjoy the new exhaust. post pics when your done

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post #14 of 31 Old 07-01-2012, 11:51 PM
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When you add both 2.5"-pipes together and get 5" that is incorrect yes it will be 5" wide total but you need to look at cicumference and surface area not width of the pipe. The single 3" pipe will outflow the dual 2.5" pipes because the 3" pipe has more surface area. The total surface area of TWO 2.5" pipes is 7.85". The total surface are of ONE 3" pipe is 9.42". So Justin you WILl gain power with a single exhaust over the dual 2.5" pipes.

I'm not a magazine racer, my car is actually fast.
I also have a Honda civic but, mine has a bigger, uglier driver.
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post #15 of 31 Old 07-02-2012, 12:43 AM Thread Starter
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Originally Posted by nasty92lx View Post
When you add both 2.5"-pipes together and get 5" that is incorrect yes it will be 5" wide total but you need to look at cicumference and surface area not width of the pipe. The single 3" pipe will outflow the dual 2.5" pipes because the 3" pipe has more surface area. The total surface area of TWO 2.5" pipes is 7.85". The total surface are of ONE 3" pipe is 9.42". So Justin you WILl gain power with a single exhaust over the dual 2.5" pipes.
Lol thanks for the info...i was thinking the same thing after I thought about it but didn't care to get into it.

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post #16 of 31 Old 07-03-2012, 10:19 PM
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3.5 single exhaust borla xr1


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post #17 of 31 Old 07-03-2012, 11:21 PM
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Quote:
Originally Posted by justinschmidt1 View Post
So I've been debating hacking the y pipe and just running a 3 inch single pipe to a muffler and dumping it over the axle.

Is this gonna sound like ass or what?


It a 4.6 mod motor with a 67mm single
how does that 67mm work for ya? what brand is it? what kind of boost and # are you seening? when is it underf full boost?

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post #18 of 31 Old 07-04-2012, 06:28 AM
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Quote:
Originally Posted by nasty92lx View Post
When you add both 2.5"-pipes together and get 5" that is incorrect yes it will be 5" wide total but you need to look at cicumference and surface area not width of the pipe. The single 3" pipe will outflow the dual 2.5" pipes because the 3" pipe has more surface area. The total surface area of TWO 2.5" pipes is 7.85". The total surface are of ONE 3" pipe is 9.42". So Justin you WILl gain power with a single exhaust over the dual 2.5" pipes.
WHAT? You mean to tell me your applying mathematics and logic? Noooo. Glad you posted this. A lot of misinformation out there about flow characteristics of exhaust and turbo piping.

They say what goes up must come down but I ain't reached my cruising altitude.
Take a look at what I did but can you imagine what I'm about to do.
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post #19 of 31 Old 07-04-2012, 11:46 AM
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There is a book out there called street turbocharging with a yellow supra on the front in this book they have a simple flow chart of single exhaust vs dual exhaust on a turbocharged car and the single exhaust is aways outflowing the dual exhaust at least up until a substantial amount of horse power then you have to up the size if i knew how to post a pic on here i would post it for you all to see. I run 3 in. all the way back through a dynomax race bullet and dump before the axle and like it a lot
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post #20 of 31 Old 07-07-2012, 11:28 PM
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So did u go single 3" yet? I think I'm going to do the same thing. The Y-pipe and awkward dual exhaust piping is more a pain to keep than just replace. Especially since I want to put a catalytic back in.

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post #21 of 31 Old 07-08-2012, 12:11 AM Thread Starter
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Well I was waiting on a muffler but keep getting the run around....Mac flow paths seem.to be on.back order. I.may just do a 3 inch straight pipe with no.muffler
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post #22 of 31 Old 07-09-2012, 07:47 AM
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The flow paths are not a good turbo muffler, you need a straight thru design.

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post #23 of 31 Old 07-09-2012, 10:08 AM Thread Starter
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Originally Posted by cravens02 View Post
how does that 67mm work for ya? what brand is it? what kind of boost and # are you seening? when is it underf full boost?
Its a comp billet wheel 67....I really dont even know how to give an impression since I have nothing to compare it to.

Im still running 4.10s in the car and its only tuned on like 9 psi....its headed back to the dyno for 3.27s and hopefully to bump the boost up to 15-16 pounds.

Hard to really say when its under full boost since 4.10s are retarded...it seems to come on hard around 4k though in 2nd gear but I can definitely see boost way before that in 3rd gear with more load on the motor.

Ill give you some better info when I get the 3.27s in there and on the dyno, should give me some good solid info on when its spooling with that setup.

Im not sure why my car made such low power but seems like something is off with my setup, maybe the cams are just awful for a turbo setup or maybe I have a weak shortblock...not sure, gonna have to see what happens on more boost here.
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post #24 of 31 Old 07-09-2012, 10:09 AM Thread Starter
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The flow paths are not a good turbo muffler, you need a straight thru design.
Ive seen a guy on here test them vs straight through magnaflows or something and he was making a retarded amount more power with the flow paths, like 40-50 rwhp I think.

Straight through doesnt always mean the best flow.....
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post #25 of 31 Old 07-09-2012, 10:34 AM
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Originally Posted by justinschmidt1 View Post
Ive seen a guy on here test them vs straight through magnaflows or something and he was making a retarded amount more power with the flow paths, like 40-50 rwhp I think.

Straight through doesnt always mean the best flow.....
I believe your thinking is all wrong on this!

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post #26 of 31 Old 07-09-2012, 11:59 AM Thread Starter
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Based on what?

Wheres your proof that a straight through muffler will outperform a mac flowpath?

I have proof for my side of the argument.....

Check this out: https://forums.corral.net/forums/supe...o-results.html

The guys making nearly 800 rwhp but still, he has numerous dyno runs showing that he lost a good bit of power with the straight through magnaflow design vs the mac flowpaths.

"Now conventional thinking would make you believe that a straight thru design muffler would be less resetrictive vs a MAC Flowpath. See pics of the Magnaflow muffler:"

"But that was not the case:

With no other changes we lost 45rwhp @ 5300rpms. "

Yea, he is making 800 rwhp but who is to say a 600 rwhp wont see gains of 20-30 rwhp?
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post #27 of 31 Old 07-09-2012, 04:04 PM
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Originally Posted by nasty92lx View Post
When you add both 2.5"-pipes together and get 5" that is incorrect yes it will be 5" wide total but you need to look at cicumference and surface area not width of the pipe. The single 3" pipe will outflow the dual 2.5" pipes because the 3" pipe has more surface area. The total surface area of TWO 2.5" pipes is 7.85". The total surface are of ONE 3" pipe is 9.42". So Justin you WILl gain power with a single exhaust over the dual 2.5" pipes.
Sorry to bring this back up, but this is wrong. Im not doin the math AutoCAD is, and it says the area of a 2.5" circle is 4.90 (x2 = 9.80). Area of a 3" circle 7.06.

I looked into this already because I plan on running my 3" DP split into two 2.5" pipes as soon as it gets past the firewall.

The determining factor is how much air needs to get out of the turbo vs. how much can flow thru your exhaust efficiently.

Also, your garden hose and straw theory is on the right track. But what's different is, there is restriction in length as well. So while you may run 3" out of the turbo, going to a 3.5 section under the car, then a 4 section over the axle (or two 2.5's for example), will reduce restriction.. But it all comes back to how much air your combo needs to move..

Hope this makes sense, Im typing very fast before leaving work.. - Jesse


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post #28 of 31 Old 07-09-2012, 04:30 PM Thread Starter
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Sorry to bring this back up, but this is wrong. Im not doin the math AutoCAD is, and it says the area of a 2.5" circle is 4.90 (x2 = 9.80). Area of a 3" circle 7.06.

I looked into this already because I plan on running my 3" DP split into two 2.5" pipes as soon as it gets past the firewall.

The determining factor is how much air needs to get out of the turbo vs. how much can flow thru your exhaust efficiently.

Also, your garden hose and straw theory is on the right track. But what's different is, there is restriction in length as well. So while you may run 3" out of the turbo, going to a 3.5 section under the car, then a 4 section over the axle (or two 2.5's for example), will reduce restriction.. But it all comes back to how much air your combo needs to move..

Hope this makes sense, Im typing very fast before leaving work.. - Jesse

Understandable....im trying to make 550ish rwhp....i guess the 3 inch pipe is a restriction but nothing I can really do a about the 3 inch downpipe, theres barely any room for that as it is but I guess I could run a larger 3.5 inch pipe section down the middle of the car.

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post #29 of 31 Old 07-09-2012, 06:02 PM
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Justin...

You referred a link to Mike Plummers facts or finding on mufflers/exhaust. 1st off your comparing apples to oranges. He is posting stuff thats directly related to the supercharger crowd. They mean nothing to us turbo guys ( his info )

The exhaust deal......he went from a 21/2 setup to a 3 inch set, then he went from a non chambered muffler to a chambered muffler....all this is blower related.

You ever notice Mike never post in turbo section.....plus he's biased to some degree, especially when you discuss e85 vs methanol. So his thread dealing with exhaust means nothing to me nor should it mean anything to you....since your doing a turbo setup

Any time you lengthen a 3 inch pipe, where you would have had two 21/2 you are creating backpressure...

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post #30 of 31 Old 07-09-2012, 06:11 PM
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3inch will be fine for 550. I wouldnt even worry about it. i have a single 3inch setup on mine with a 3inch straight though magnaflow and havent had any issues. i was having converter issues on the dyno but when i took the exhaust off from the downpipe under the car i gained 7hp on the dyno.

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post #31 of 31 Old 07-09-2012, 07:16 PM Thread Starter
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oo did not know that, guess that is true, turbos a bit different, either way, I doubt running a 3 inch straight pipe dumped will be a restriction for me.

7 hp, i don't even think a normal human can feel 7 hp difference lol
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