lol just messin with you 3" will be fine 
3' vs. 3.5' vs. 4'
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Turd Gen Guy
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Joined: Dec 2008
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From: andalusia, alabama
3' vs. 3.5' vs. 4' ok. so i have heard a well build 4 body needs more than a 3' single exhaust. i was looking at the mufflex catback but would 3.5' be too much for a h/c/i 5.3 with a 100-150 shot? mufflex is the only company i know that makes exhaust for a f-body that is available in 3.5 and 4'. but if the magnaflow 3' exhaust wouldnt choke my motor im going to go with it because it is alot less. and i believe the 4' would be way too big for a 5.3 or 5.7. maybe for a 402 or larger build. i know you need backpressure so would a set of 1 3/4 stainless works headers with a 3' y pipe into a 3.5 single mufflex exhaust work for my motor?
Last edited by 1nasty86; Jan 8, 2010 at 11:58 AM.
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you dont need to worry about back pressure on these cars dude, but 3" is fine just use the cutout to get your horse or true duals like the other guy side is good option, just hard to fit sometimes
see, the catback doesnt matter aslong as u have a cutout and even though his numbers are great if he had done a bigger cutout he may have even gained more horse power but its all about your goals a nice magnaflow or hooker catback and a cutout should do fine, if u have a large cam and heads and really looking to squeeze those numbers out u might want to upgrade to a 3.5 or 4" cutout or dual cut outs but i dont see a need for a 4" exhaust all the way back
Joined: Aug 2007
Posts: 24,241
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From: Turnin' Wrenches Infractions: 005
you dont "need" backpressure for anything. Its a myth created by idiots 
Go with the biggest exhaust you can fit. Bigger wont hurt you, smaller may.........
Go with the biggest exhaust you can fit. Bigger wont hurt you, smaller may......... 