Exhaust Size Question

alvispace

alvispace

Fat Bastard
Joined
Oct 8, 2007
Messages
205
Can someone school me on the why an exhaust that is bigger than the TOP is actually necessary? I understand the whole breathing thing and making sure no backpressure, but after no backpressure is assured, how does a 5" out perform a 4"? Is my assumption of little or no backpressure with a 4" exhaust wrong?) Isn't the TOP the limiting factor then the theoretical max flow of the turbo?

Thanks for your help in understanding.
 
just do a 6" turbo back.:rockwoot:
nuff said

you will love it.... until your truck catches on fire in the middle of the night.
 
FirstOnRaceDay said:
A 4" exhaust will flow all the air you will ever need but a 5" sounds better.
Click to expand...


so something sounds better then a 4in straight piped?!?
 
i saw a freakn dodge the other day that had a huge piece of slinky duct run out under the truck for the exhaust. looked horrible why someone would think it would look good i dont know. yeah i have 4" never heard a 5" i like mine
 
4" exhaust will flow all you need until you start hitting around 700 horsepower. At that point, the 4" exhaust is a restriction and you need to step up to 5".
 
hpprose said:
4" exhaust will flow all you need until you start hitting around 700 horsepower. At that point, the 4" exhaust is a restriction and you need to step up to 5".
Click to expand...

^^^^ What he said! :rockwoot:
 
ChaseN said:
just do a 6" turbo back.:rockwoot:
nuff said

you will love it.... until your truck catches on fire in the middle of the night.
Click to expand...


Is there even a 6" downpipe available for the 6.0? If a 4" downpipe is a chore to get aligned and fitting properly how would a 6" even fit?
 
I think he just meant after the downpipe. Not sure though. Chase gets some crazy azz ideas sometimes...LOL
 
haha no 6" DP out there (that i know of).

i was just being a smart a$$ about fords burnin up haha.
okay, i'll stop now
 
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