swappers, what did you do for exhaust? Options

[brianforster]

now we all know that 3" is pretty standard for all our swappers.

what did you do for exhaust? custom from a shop close to you? make it on your own?

whatd the shop quote you?

how much was it if you did it yourself?

looking for general price quotes here, trying to plan out the finishing touches of the swap and the only exhaust shop i called said "theyd have to look at the car".

to cut down on costs i think im going to buy my own cat and muffler from summit (43 bucks for cat, 18 bucks for muffler, summit turbo muflers for the win!) i just wanna know if you guys have any idea what it will cost. i already have a downpipe.

i tried searching, but everyone just says they have 3" exhaust, not where or how they aquired it, and since they are all custom, was wondering what everyone did for it!

thanks as always
-brian

[playr158]

Oversizing the exhuast can hurt due to the density, weight and velocity of the air traviling through it.

sorry i should have been more clear..that was a long night..
4" is pretty utterly pointless on a motor thats not supporting the HP for it..like the above stated oversized pipe without enough power to move the air isn't helping at all...yea "noshoes" can run 4" cause his pipe is 3' long in a "2" and he has a pretty freakin nice HP #......a stock 3sgte in a 10' long celica with 4" i doubt would see any gains..so "noshoes" motor and setup really doesn't apply in a celica situation..

and j...even on an FI motor if your exhaust is too big and long the exhaust velocity will eventually have slowed by the end of the pipe..you'll have increased back pressure from having to actually push the spent and slowed gases out regardless of FI or NA

its about correct size for your correct horsepower and CFM...you have to keep restritctions to a minimum and velocity to a maximum

This post has been edited by playr158: Mar 12, 2006 - 4:04 PM

[jgreening]

"noshoes" can run 4" cause his pipe is 3' long in a "2" and he has a pretty freakin nice HP #......a stock 3sgte in a 10' long celica with 4" i doubt would see any gains..so "noshoes" motor and setup really doesn't apply in a celica situation..

Actually, its even MORE applicable. Try this experiment. Blow as hard as you can through a regular straw. Now cut the straw down to 2 inches and blow as hard as you can. Tell me which one flows more air. A: the shorter one of course. Flow is increased when the pipe length is decreased. The benefits from a larger diameter exhaust are more apparent in cars requiring longer piping - not less. Noshoes actually recommended to me to go with a 4" exhaust for just these reasons. Since my goals were less than most of his customers, I stayed with 3".

Although this argument about exhaust gases cooling and slowing down has some logical appeal, I am just saying that I have never seen any evidence it is true in terms of real world experience or reading what recognized experts have posted in the past.

This post has been edited by jgreening: Mar 12, 2006 - 4:40 PM