Exhaust pipe diameter?
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Exhaust pipe diameter?
I’m trying to decide between 2.5” vs. 3” cat back exhaust. I have a 1995 F150 2wd 5.0. I think I have decided on the Dynomax Turbo muffler with a single pipe out the rear side. I’m not looking for anything loud or for looks. Just want an efficient exhaust system that will still pass CA’s smog inspections. Oh and I’m trying to keep the cost down so no Flowmasters for me this time. I also am considering <st1:city w:st="on"><st1>Summit</st1>'</st1:city>s Cat back system with their name brand muffler. Any suggestions or comets on my ideals would be greatly appreciated.
Dave
Dave
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From: Davis & Newcastle, CA
3 inch might be a little overkill for the 302. Conanski seems to be pretty educated about exhaust, he'd be the one to ask. I have heard that there IS such a thing as going too big. For a stock 302 I don't think you want anything bigger than 2 1/2. My 351 has a single 2.75 and it breaths just fine.
-Chris
-Chris
Last edited by Skandocious; May 2, 2007 at 07:33 PM.
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From: Davis & Newcastle, CA
Found some of Paul's words of wisdom on the subject:
Originally Posted by Conanski
Exhaust backpressure does not help power production, that's on old myth propagated by those that don't understand gas flow. Anything you can do to improve the air pumping abilities of a motor will increase output, the trick is boosting the right rpm range. Short dual systems tend to boost upper rpm power more, while longer single systems will boost lower rpm. Same applies to headers, shories boost upper rpms, longtubes boost lower.
Size is important as well, an oversized system will not maintian sufficient gas speed to act as a vacuum to help pull the next exhaust pulse out, while undersised plumbing is just restrictive. The goal of the factory exhaust systems is mainly noise control.
A single mendrel bent 3" system should be the minimum for a 460, bigger if crimp or wrinkle bend tubing is used. And remember the whole system only flows as well as the most restrictive part, so if you put a cork of a muffler right in the middle all the mendrel bent tubing is wasted.
Size is important as well, an oversized system will not maintian sufficient gas speed to act as a vacuum to help pull the next exhaust pulse out, while undersised plumbing is just restrictive. The goal of the factory exhaust systems is mainly noise control.
A single mendrel bent 3" system should be the minimum for a 460, bigger if crimp or wrinkle bend tubing is used. And remember the whole system only flows as well as the most restrictive part, so if you put a cork of a muffler right in the middle all the mendrel bent tubing is wasted.
Senior User
Joined: Aug 2006
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From: San Mateo
I Have a 1996 F150 with a 351W. I upgraded my stock exhaust system with summit cat back kit. I wanted the 3" duel rear split but this meant removal of spare tire, so I went with 2.25". I added some 18" long, 3" diameter magnaflow tips. The sound is a mellow deep hum. The turbo muffler that comes with the kit is awsome. I have had many compliments on sound and look of the exhaust, and for the price, you cant go wrong. I am 100% happy with my new kit!
Shane
Shane
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