GodAmGT00

I wouldn't say this is entirely true, however, it's a combination of things, with direct correlation to exhaust size..


Going to a 3" pipe in this case doesn't slow velocity as much from temperature as it does from rapid expansion, which causes a different buffer in the exhaust pulses.. Sure, the exhaust is going to cool as it travels down, but the pressure drop from going up a .5" ID is a big expansion for any type of gas, and a major decrease in pressure..




JT

avlon06

Are SLP 3 in?

562cobra

slp is 2.5"

and to op: i your going with 3" catback, might as well go with the 3" midpipe.
and some headers. and have a full 3" catback ftmfw. thats what im planning on doing but business is slow.

that is all

pcs

im not trying to change the scope of the thread, he just wanted to know if a 3" cat back was too big for a stock stang, it might be, it might not be and he wants it to be loud, if that is what he wants, go for it 99gt. also,
bernoulli's eqn' does state that an increase in velocity will cause a decrease in local pressure (or vice versa), that is a basic concept of how a planes wing causes lift or a steam powered turbine works. so i dont know where you went to school, but maybe you didnt get your moneys worth or you fell asleep during that lecture.

godamgt00 not that im trying to disagree with you, but a gas will try to move from a high pressure to low pressure, so if their is a drop in pressure across a pipe the gas will move on its own w/o any help. so its really just a bunch of different variables that will affect the flow of exhaust out the tail pipe. in the end the "best" exhaust is going to be a custom made one for your application.

NeedStangSpeed

Well... would it really make much of a difference what size the pipe is behind the headers if the collectors reduce to 2.5" anyway? It wouldn't let it flow any better unless it was unrestricted 3" the whole way through(header, mid pipe, and cat back) with no part of it being 2.5".