e36blownpast said:

hey im doing the 1jz swap on my 1992 325i and im looking for exhaust advice...i plan on doing all custom straight piping but im aware that i need some back pressure...so i need a muffler...now im not looking for anything that will make my car look like poop so big a$$ cans will not do lol anyone have any advice for an exhaust that does these functions: look clean, sound good, and be free flowing because....well its a boosted engine lol so suggestions?

Run it strait back, i run open wg dump and 3" all the way back....your back preasure for the motor is the turbo.

Derek

patsbimmer1 said:

You've got half of it.  In a boosted application you don't need to worry about backpressure but you still want it. The turbo itself creates the backpressure and exhaust resonance necessary for scavenging in the cylinder head.

This sounds like a good idea to me!  My brother in law ran 2 magnaflows on his A6 2.7t and it sounded like a beast!

Sorry, I didn't quanitfy my answer by saying "in a boosted application" because we're talking about a 1jz.

240sxguy said:

You definitely don't need or want backpressure.

You've got half of it.  In a boosted application you don't need to worry about backpressure but you still want it. The turbo itself creates the backpressure and exhaust resonance necessary for scavenging in the cylinder head.

Earl said:

A 3" pipe with an 18" resonator, no cat, and a nice free flowing magnaflow would sound great:)

This sounds like a good idea to me!  My brother in law ran 2 magnaflows on his A6 2.7t and it sounded like a beast!

Snap said:

Magnaflow says it best, plus there is a handy diagram to help size the pipes

http://www.magnaflow.com/07techtips/faq/question10.asp

all about that stepped header

http://www.magnaflow.com/07techtips/faq/question10.asp