+500whp exhaust??Big hp please step in.

BLACKMACH1 · 04-28-2009, 12:05 AM

Right now I'm running dual 2.25 into thrush 2 chamber welded mufflers with 2.25 tailpipes long tube headers making 500whp

with a procharger on a 351c.
Would like to hear what mufflers you bigger hp guys are running and what size.

MARK 302 · 04-28-2009, 08:06 AM

Making over 600rwhp, and I have longtubes with a 3 inch X and 2 1/2 inch mufflerss and tailpipes.

avbcon12 · 04-28-2009, 08:57 AM

longtubes, 3" h-pipe, 3" MAC pro-dumps.

soon to be catted

chinopsu · 04-28-2009, 09:23 AM

550RW; BBK 1 3/4" long tubes; 3" Off road Xpipe; 3" Dynomax Super Turbo mufflers to dumps; Would prefer tail pipes

buddha · 04-28-2009, 09:26 AM

Well, I wouldn't consider my car to have big HP by today's standards, but here goes:

1 3/4" Bassani shorties
2 1/2" Hi-flow catted x-pipe
3 Chamber Flowmaster
2 1/2" tailpipes

550rwhp

fastgtfairlane · 04-28-2009, 09:47 AM

i would recommend a 3inch dr gas x pipe with 3 inch spintech prostreet cat back. best sounding exhaust on the market

BLACKMACH1 · 04-28-2009, 10:54 AM

I see a pattern with the xpipe.Does it help with reducing back presssure or sound? Most test that I've read only show moderate increase in power from them,like 5-8whp.

Novi357 · 04-28-2009, 11:26 AM

I have a 3 inch h-pipe into 3 inch walker race magnums into 3 inch flowmaster tailpipes.

Headers are 2 inch primary.

Over 1000 rwhp

Macs Stang · 04-28-2009, 12:01 PM

Quote:

Originally Posted by Novi357

I have a 3 inch h-pipe into 3 inch walker race magnums into 3 inch flowmaster tailpipes.

Headers are 2 inch primary.

Over 1000 rwhp

In these parts we call that being a big dawg.

buddha · 04-28-2009, 02:18 PM

Quote:

Originally Posted by Novi357

Over 1000 rwhp

Do you have any vid's of that thing running down the track? I'd like to see one, espcially on the 17 inch wheels..........crazy!

buddha · 04-28-2009, 02:20 PM

Quote:

Originally Posted by BLACKMACH1

I see a pattern with the xpipe.Does it help with reducing back presssure or sound? Most test that I've read only show moderate increase in power from them,like 5-8whp.

While the power increase is nice, I went that route just for something different. H-pipes are kinda like ########.....everybody's got one. I love the way mine sounds.

avbcon12 · 04-28-2009, 02:49 PM

Quote:

Originally Posted by BLACKMACH1

I see a pattern with the xpipe.Does it help with reducing back presssure or sound? Most test that I've read only show moderate increase in power from them,like 5-8whp.

theres a few hp up top with an X-pipe, not a ton. most go with it for the sound, higher pitched up top and not as "boomy" down low.

Novi357 · 04-28-2009, 03:13 PM

Quote:

Originally Posted by buddha

Do you have any vid's of that thing running down the track? I'd like to see one, espcially on the 17 inch wheels..........crazy!

Here is a video

http://videos.streetfire.net/video/8...-17_198475.htm

As far as the original question, a lot of power can be made through a basic exhaust that isn't oversized. I made 670 rwhp through 1 5/8 shorty headers, a 2.5 inch h-pipe, 2.5 inch dynomax mufflers and 2.5 inch tailpipes.

flyin_hawaiin · 04-28-2009, 03:35 PM

ive got a customer running 9.20s with 1 5/8 shorties and 2.5inch exhaust!

buddha · 04-28-2009, 05:31 PM

Quote:

Originally Posted by Novi357

Here is a video

http://videos.streetfire.net/video/8...-17_198475.htm

As far as the original question, a lot of power can be made through a basic exhaust that isn't oversized. I made 670 rwhp through 1 5/8 shorty headers, a 2.5 inch h-pipe, 2.5 inch dynomax mufflers and 2.5 inch tailpipes.

What are you doing for suspenion on that car? C-4? What size 17' tire? Looks like it leaves straight as an arrow with no drama. That's one hell of a car you've put together to run down the track like that!

Novi357 · 04-28-2009, 06:29 PM

Quote:

Originally Posted by buddha

What are you doing for suspenion on that car? C-4? What size 17' tire? Looks like it leaves straight as an arrow with no drama. That's one hell of a car you've put together to run down the track like that!

I'll answer it in a pm so i don't thread jack

BLACKMACH1 · 04-28-2009, 10:44 PM

I know hp can be made thru small exhaust,just how muchhp am I leaving on the table with kink bent 2.25 exhaust? Anyone have any before and after results?

dgrobels · 04-29-2009, 04:47 PM

I would say your leaving a decent amount of power on the table

what are the engine specs?

I run 3" with h pipe and dumps and make around 525 fwhp

subtlebeast · 04-29-2009, 04:55 PM

I am running 1-3/4" Accufab longtubes, 3" Dr gas X, 3" Dynomax Ultraflos, 3" tails on my 347 Ysi combo. I don't have any numbers, but I am heading to the dyno tomorrow.

Macs Stang · 04-29-2009, 07:11 PM

I am running BBK 1 3/4 long tubes, Dr. Gas 2 1/2 x-pipe, Mac 2 1/2 pro dumps.

I made 635 rwhp and 605 rwtq.

I would imagine that I could make more with 3".

Carbuff91 · 04-29-2009, 07:52 PM

Quote:

Originally Posted by Novi357

I have a 3 inch h-pipe into 3 inch walker race magnums into 3 inch flowmaster tailpipes.

Headers are 2 inch primary.

Over 1000 rwhp

I've seen Brians car run, and damn it's funny to hear what people say that have never seen the car before. Maybe one day I'll be a big dog too!

Carbuff91 · 04-29-2009, 07:55 PM

I think Brian is the correct name?

BLACKMACH1 · 04-29-2009, 11:39 PM

Quote:

Originally Posted by dgrobels

I would say your leaving a decent amount of power on the table

what are the engine specs?

I run 3" with h pipe and dumps and make around 525 fwhp

351c .030 over,stock 4v iron heads 9:1 comp.decent cam good valve springs,blow thru carb p1sc spinning to 58k 10psi boost total timing with meth 29 degrees.Long tube headers c4 trans 3.90 ford 9inch. In a 3800lb TANK!

modo · 04-30-2009, 12:17 AM

have made damn close to 700 rwhp with 1 3/4" shorties, 3 in all the way back through 2 chamber flows, tail pipes

could have made more but that was on straight pump gas. when i get my motor back i plan on changing to dynomax ultraflows and meth so who knows what it will make then

331merc · 04-30-2009, 02:07 PM

Quote:

Originally Posted by Novi357

As far as the original question, a lot of power can be made through a basic exhaust that isn't oversized. I made 670 rwhp through 1 5/8 shorty headers, a 2.5 inch h-pipe, 2.5 inch dynomax mufflers and 2.5 inch tailpipes.

x2. I made similar power with the same stuff. 2.5" Dynomax Ultra flows and tail pipes. It ran 9's @ 140mph in the quarter.

Would it have made more power with a 3" system? Maybe a little. Not enough for me to justify the cost and effort. Plus I refused to put long tubes on my lowered street car anyways.

MARK 302 · 04-30-2009, 10:52 PM

Quote:

Originally Posted by 331merc

x2. I made similar power with the same stuff. 2.5" Dynomax Ultra flows and tail pipes. It ran 9's @ 140mph in the quarter.

Would it have made more power with a 3" system? Maybe a little. Not enough for me to justify the cost and effort. Plus I refused to put long tubes on my lowered street car anyways.

Why don't you like longtubes? I run longtubes and my car is low. I did had my headers modified to be tight under the car.

buddha · 04-30-2009, 11:03 PM

I won't run them either. Just not worth all the effort in IMO. Of course I've never had a set of of Kooks with slip on collectors either.

331merc · 04-30-2009, 11:23 PM

Quote:

Originally Posted by MARK 302

Why don't you like longtubes? I run longtubes and my car is low. I did had my headers modified to be tight under the car.

Long tubes can be a pita to install. Most have fitment issues. They hang low unless modified like yours. lots of heat. Stuff like that.

I thought about making a custom set of headers, maybe a mid length. But i figured if I was going to make headers I would make turbo headers. hahaha

Blown5.0lx · 05-02-2009, 03:33 AM

Quote:

Originally Posted by Macs Stang

In these parts we call that being a big dawg.

You load

Macs Stang · 05-02-2009, 08:15 PM

Quote:

Originally Posted by Blown5.0lx

You load

I never said I was a big dawg.

87331ysi · 05-05-2009, 08:42 PM

I used a set of Mac 1 3/4 shorties and the flowmaster full 3 inch kit minus the tail pipes, ran dumps made 725rwhp on a safe tune with that set up, now I have Kooks 1 7/8 with 3.5 bullets no numbers yet.

BLACKMACH1 · 05-06-2009, 10:41 AM

THANKS, everyone that posted has bigger and better exhaust than mine.I think it's time to upgrade. Dynomax ultraflow muffler with 2.5 all the way back should be ok for my setup

botlrokit93 · 05-06-2009, 12:28 PM

2.00" Kooks, 3.50" collectors, 3.50" Borla XR1 Racelines here..... sounds pretty stock.

Macs Stang · 05-06-2009, 12:31 PM

Quote:

Originally Posted by botlrokit93

2.00" Kooks, 3.50" collectors, 3.50" Borla XR1 Racelines here..... sounds pretty stock.

LOL

BLACKMACH1 · 05-06-2009, 02:16 PM

Sounds stock?? Thats huge exhaust.

I wish there were some blown mustangs local to me.Would like to get a comparison of exhaust and hp against mine. I'm tired of ls1 this ls2 that and bbc's.. Chevy pops a decent head on a aluminum sbc and everyone thinks it's gods gift to gearheads. My 351c with a .510 lift cam n/a made 300whp stock iron 1972 heads. Now thats a gift!