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Old 06-06-2012, 07:56 PM   #1
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Exhaust abd lost power

It my car back with redone exhaust and it feels like I've lost a good bit of power any ideas? Maybe to much fuel with to much back pressure ? Hell if I know. Just not happy. But it does sound good
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Old 06-06-2012, 08:07 PM   #2
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What all have you done to it?..
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Old 06-06-2012, 08:12 PM   #3
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Well I had 3inch with flow master 40's cut of at te axle. And I went back with 2 1/4 fully out the rear no cats with 40 series. (wanted 2 1/2 but dude put that one it. Let's say I got a discount for it)
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Old 06-06-2012, 08:20 PM   #4
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Stock size is 2 1/2

---------- Post added at 07:20 PM ---------- Previous post was at 07:19 PM ----------

2 1/4, my bad
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Old 06-06-2012, 08:41 PM   #5
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Yea that's why I told him 2 1/2 but guess he didn't listen so he put 2 1/4 So what ur saying in nice terms is DUH there will b a big drop? Lol

---------- Post added at 08:24 PM ---------- Previous post was at 08:23 PM ----------

I knew that was stock and that's why I wanted 1/2 and not 1/4 but he did what he wanted I guess

---------- Post added at 08:41 PM ---------- Previous post was at 08:24 PM ----------

But could just that alone kill a good bit of power?
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Old 06-06-2012, 09:17 PM   #6
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Quote:
Originally Posted by Maddhatter88
Yea that's why I told him 2 1/2 but guess he didn't listen so he put 2 1/4 So what ur saying in nice terms is DUH there will b a big drop? Lol

---------- Post added at 08:24 PM ---------- Previous post was at 08:23 PM ----------

I knew that was stock and that's why I wanted 1/2 and not 1/4 but he did what he wanted I guess

---------- Post added at 08:41 PM ---------- Previous post was at 08:24 PM ----------

But could just that alone kill a good bit of power?
Short answer!... Yes!.....
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Old 06-06-2012, 09:19 PM   #7
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Well that sucks. Guess I'll get it redone when I get my headers. That was a waste of money lol
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Old 06-06-2012, 09:35 PM   #8
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its possible. i read an article with a guy that had a low 10 second car. and when he went from 3 to 2 1/2 he lost over a 1/2 second at the track. but this kinda answer can vary. the more thats done the more the exhaust needs to breath. but the older exhaust would definatly breath better.
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Old 06-06-2012, 10:02 PM   #9
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So basic redneck logic bigger exhaust better power lol
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Old 06-06-2012, 10:04 PM   #10
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Quote:
Originally Posted by Maddhatter88
So basic redneck logic bigger exhaust better power lol
basically.
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Old 06-06-2012, 10:16 PM   #11
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Thanks. I knew it would kill power but didn't think it would b that much lol
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Old 06-06-2012, 10:20 PM   #12
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Well i can tell how much" it "is. But noticeable I can definitely see.
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Old 06-06-2012, 10:26 PM   #13
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Well since imma do a blower I guess imma go back with 3inch when I get my headers
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Old 06-06-2012, 10:34 PM   #14
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Were you running a full 3" from the headers back?
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Old 06-06-2012, 10:44 PM   #15
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Quote:
Originally Posted by 93slowstang
Were you running a full 3" from the headers back?
Yea like they kept bout 4 inches of the old from where it connected to the manifold and slid the 3 inch over it then ran 3 inch all the way to the rear axle where they had 40series with turn downs
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Old 06-06-2012, 10:53 PM   #16
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Quote:
Originally Posted by Maddhatter88

Yea like they kept bout 4 inches of the old from where it connected to the manifold and slid the 3 inch over it then ran 3 inch all the way to the rear axle where they had 40series with turn downs
That's why you lost power then. A 3" exhaust is overkill for a n/a 302 and will create more back pressure than the 2 1/2". Running a 3" after a 2.5" mid pipe would be beneficial, especially dumped.
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Old 06-06-2012, 10:58 PM   #17
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U kinda lost me there. So what would you run?
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Old 06-06-2012, 11:08 PM   #18
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Headers, 2.5" o/r mid pipe, and a 3" catback. Here's an article to help explain. Even has dyno numbers as well.

http://www.carcraft.com/techarticles...ion/index.html
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Old 06-06-2012, 11:13 PM   #19
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I woulda nvr thought of doing 2 diff sizes
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Old 06-06-2012, 11:14 PM   #20
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I didn't either till I read that article some time back.
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Old 06-06-2012, 11:16 PM   #21
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But u can't get 3 inch all the way out the rear it won't make if over the axle will it?
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Old 06-06-2012, 11:22 PM   #22
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Quote:
Originally Posted by Maddhatter88
But u can't get 3 inch all the way out the rear it won't make if over the axle will it?
I doubt it if the car is lowered, but you can still run 3" dumped before the axles. I have seen a full 3" catback for the foxes but don't have experience with any.
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Old 06-06-2012, 11:25 PM   #23
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Yea that's how this guy had it and I couldn't have it dumped bc my wife couldn't ride in it bc I the fumes and stuff. So kinda trying to get it where she can ride in it plus keep the power lol

---------- Post added at 11:25 PM ---------- Previous post was at 11:24 PM ----------

Was thinking bringing it out right b4 the rear wheels instead of just dumping it but dnt think that would really help any
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Old 06-07-2012, 02:17 AM   #24
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My dad just ordered a 3" muffler back kit from summit made by flowmasrer...it was $200 something but it was all mandrel bent..very nice and sounded awesome...but then again his fox is a high 9 second car...my advice is get that kit and run your 40 series flowmasters and a 2.5 O/r pipe...makes for very nice results.something obout the mustang that likes that setup
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