3.5" muffler + dump vs. 3.5" -> dual 2.5" tailpipes?? - Ford Mustang Forums : Corral.net Mustang Forum
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post #1 of 37 Old 03-19-2009, 08:45 PM Thread Starter
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3.5" muffler + dump vs. 3.5" -> dual 2.5" tailpipes??

The single 3.5" seems so much simpler but I am thinking of running 2 mufflers and just y'ing off the downpipe.

Anyone have an opinion on what they like or have sound clips?

Hard to find any real info


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post #2 of 37 Old 03-19-2009, 08:55 PM
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dual 2.5s are going to be heaver and sound better imo. 3.5" dump will be lighter, but not sound as good. Either dual 2.5s or a single 3.5 will flow plenty.


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post #3 of 37 Old 03-19-2009, 09:05 PM
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I run a 3" dp and dual 3" exhaust, no mufflers, dumps at the axle

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post #4 of 37 Old 03-19-2009, 09:05 PM
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I've had both. The single 3.5" dump (Borla XR-1 muffler) sounds like garbage and cabin noise in unbearable. I did not notice an increase in power over SLP loudmouth cat back i had prior to the dump.

However, with the exhaust completely off and running an open downpipe, I noticed more power and faster turbo spool.

In a few weeks I'm going back to tailpipes with a Dynomax ultra flow cat-back. However, I'm welding in a 3.5" cutout before the y-pipe so I can have an open DP when I go to the track.

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post #5 of 37 Old 03-20-2009, 05:58 AM Thread Starter
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Any other opinions?

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post #6 of 37 Old 03-20-2009, 08:20 AM
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I have never liked dumps on a srteet driven car. In my opinion it's not worth the interior noise and exhaust fumes.
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post #7 of 37 Old 03-21-2009, 11:52 AM Thread Starter
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ttt

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post #8 of 37 Old 03-21-2009, 12:20 PM
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I have a 3" downpipe, I used this Y pipe I got from Summitt for like $25 and had the muffler shop connect it to my Maganflow catback.


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post #9 of 37 Old 03-21-2009, 04:38 PM
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Pony Down's y-pipe uses a 3" inlet and 2.5" outlets.

I'm having them custom make me just the y-pipe using a 3.5" inlet that splits to dual 3" with 2.5" ball flanges on the end using these from flowmaster:


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post #10 of 37 Old 03-21-2009, 05:55 PM Thread Starter
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Quote:
Originally Posted by bikewiz View Post


Pony Down's y-pipe uses a 3" inlet and 2.5" outlets.

I'm having them custom make me just the y-pipe using a 3.5" inlet that splits to dual 3" with 2.5" ball flanges on the end using these from flowmaster:

Would say thats what I need, but I need 3.5"


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post #11 of 37 Old 03-21-2009, 06:29 PM
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3" is plenty if your splitting them.....
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post #12 of 37 Old 03-21-2009, 06:41 PM
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Rich Gill, you can buy a 3.5" to dual 3" y from Summit or Jegs. Flowmaster makes them. That is how i will be setting up exhaust from a 3.5 dp.

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post #13 of 37 Old 03-21-2009, 06:42 PM
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Rich,

I e-mailed Jeff at Pony Down Performance about making a custom pipe and this is what he said:

Quote:
Yes we can do that for 250 shipped. So we would do the back section of the y-pipe. Custom 3 1/2 in and dual 3" out to 3" balls. If you want to you can order it off the website and I'll push it through for you with those specs. Just leave a note on it and I can get rid of the shipping cost so don't worry about that.

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post #14 of 37 Old 03-21-2009, 06:43 PM
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Rich Gill, you can buy a 3.5" to dual 3" y from Summit or Jegs. Flowmaster makes them. That is how i will be setting up exhaust from a 3.5 dp.

Pony Down uses the flowmaster Y in their pipe

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post #15 of 37 Old 03-21-2009, 10:21 PM Thread Starter
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yea but I have 2.5" tailpipes, I wonder if thats going to be too small??

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post #16 of 37 Old 03-22-2009, 01:35 AM
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What mufflers are you running? I made the #'s in my sig with the standard HP performance exhaust setup and an SLP loudmouth (2.5").

Yeah a 3" catback would be better, but I don't know who makes one that uses non-chambered mufflers. You should be just fine with 2.5" tailpipes and a decent set of mufflers like Dynomax Ultra flows.

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post #17 of 37 Old 03-22-2009, 06:21 AM Thread Starter
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What mufflers are you running? I made the #'s in my sig with the standard HP performance exhaust setup and an SLP loudmouth (2.5").

Yeah a 3" catback would be better, but I don't know who makes one that uses non-chambered mufflers. You should be just fine with 2.5" tailpipes and a decent set of mufflers like Dynomax Ultra flows.
was planning on using the dynomax or magnaflows

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post #18 of 37 Old 03-22-2009, 09:48 AM
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Good choice. I don't think you will have any problems with a standard 2.5" cat-back. I mean bigger never hurts with a turbo, but there isn't much available for 3" systems. I can't run a 3" system because I have a MM panhard bar, but 2.5" seems to work just fine for me.

You are running a turbo right? Your sig says SC.

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post #19 of 37 Old 03-22-2009, 09:59 AM Thread Starter
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Good choice. I don't think you will have any problems with a standard 2.5" cat-back. I mean bigger never hurts with a turbo, but there isn't much available for 3" systems. I can't run a 3" system because I have a MM panhard bar, but 2.5" seems to work just fine for me.

You are running a turbo right? Your sig says SC.
?yea BG kit on order, guess I should update my sig

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post #20 of 37 Old 03-22-2009, 12:03 PM
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I run a single 3.5" that is dumped at the axle. It makes it really easy to remove with all the time a turbo mustang spends on the jack stands. Haha.

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post #21 of 37 Old 03-22-2009, 12:21 PM Thread Starter
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I run a single 3.5" that is dumped at the axle. It makes it really easy to remove with all the time a turbo mustang spends on the jack stands. Haha.

Think you can take a video or sound clip?

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post #22 of 37 Old 03-22-2009, 12:26 PM
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I will get you a video here in the next week or so. The car is currently on jack stands w/ the exhaust removed. I have been changing out the trans and doing a front coilover swap.

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post #23 of 37 Old 03-22-2009, 12:47 PM
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Quote:
Originally Posted by staticstang View Post
I will get you a video here in the next week or so. The car is currently on jack stands w/ the exhaust removed. I have been changing out the trans and doing a front coilover swap.
You too??

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post #24 of 37 Old 03-22-2009, 03:12 PM
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You too??
Coil overs FTW!!! I changed out the old lakewood struts and shocks for some strange adj. and coil overs. I am hoping for some good weight transfer....we'll see....

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post #25 of 37 Old 03-22-2009, 03:46 PM
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What muffler would be recommended for a single 3.5" to keep it nice and quiet?

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post #26 of 37 Old 03-22-2009, 05:16 PM
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Here are some crappy pics of the exhaust laying on the garage floor...







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post #27 of 37 Old 03-22-2009, 05:21 PM
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What muffler would be recommended for a single 3.5" to keep it nice and quiet?
You might want to look into a dynomax ultra-flow or something similar.

I am running a race bullet. I thinks that it sounds good on my car with my setup, but I have heard it on other cars that don't sound that great.

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post #28 of 37 Old 03-23-2009, 08:57 AM
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What muffler would be recommended for a single 3.5" to keep it nice and quiet?
well, 3.5" and 'nice & quiet' don't belong in the same sentence. make sure you use an oval muffler, not a round/bullet one. the ovals have more packing, so they're quieter. tailpipes quiet things down too (instead of dumps).

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post #29 of 37 Old 03-25-2009, 02:05 AM
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well, 3.5" and 'nice & quiet' don't belong in the same sentence. make sure you use an oval muffler, not a round/bullet one. the ovals have more packing, so they're quieter. tailpipes quiet things down too (instead of dumps).
I was planning on using an oval muffler. But I want to stay 3.5" for simplicity. Just enough to quiet down open downpipe. The quieter the better in my opinion.

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post #30 of 37 Old 03-25-2009, 08:55 AM
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i run a single 3.5" with a dynomax oval muffler to the axle. it's not bad at all. a tailpipe will make a big difference.

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post #31 of 37 Old 03-25-2009, 09:15 AM Thread Starter
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Quote:
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i run a single 3.5" with a dynomax oval muffler to the axle. it's not bad at all. a tailpipe will make a big difference.
Any chance u can get a video?

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post #32 of 37 Old 03-25-2009, 11:22 AM
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sorry, car is apart.
i can upload some vids from the track.

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post #33 of 37 Old 03-25-2009, 12:24 PM
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Quote:
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sorry, car is apart.
i can upload some vids from the track.
Do that - i've never seen a vid of your car!!!

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post #34 of 37 Old 03-25-2009, 02:45 PM
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nothing much to see. it's the most boring 10.0 car to watch. seriously.
http://classicboost.com/Documents/10-137.wmv

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post #35 of 37 Old 03-25-2009, 03:25 PM
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