[Blackbird_Pilot]

Great write up on the backpressure. Now a question on it. What diameter of exhaust is recommended for the rex? Right now the engine is stock, but I'm doing a b18 swap later this summer. Mostly street but some mountain high reving action!

Thanks
BP

 

[SETI20]

Did you mean to reply to a thread...but accidentally created a new one?
I'm kinda-sorta lost here.

 

[Blackbird_Pilot]

Did you mean to reply to a thread...but accidentally created a new one?
I'm kinda-sorta lost here.

I'm kinda-sorta with ya. I tried to reply to that back pressure write up but I couldn't. Said it was locked.
Slap me, thats ok.
:shock:

 

[ludesrv]

I have a 2 1/4 incher all the wya back with high flow everything on my Hatch, with a stock LS to power it...for now. It's plenty of exhaust for the LS, even a nicer VTEC engine.

 

[mattminerDOTcom]

I have a 2.5" setup now thats working fine on my GSR motor. Swapping for a 3" exhasut for my new setup.

[email protected]

 

[jfrolang]

2.25" should be enough for most N/A setups, unless you're trying to extract every bit of top end from a built B16 or something, in which case 2.5" will be enough.

3" is the win for turbo.

 

[toxiclows]

I have a 2.5" setup now thats working fine on my GSR motor. Swapping for a 3" exhasut for my new setup.

[email protected]

3 inch is a tad overkill for MOST 4 cylinder cars. . heck just look what comes stock on the cars . . 2 2.25 2.5 should be more than enough for most applications.. gotta love the look of the 3 inch pipe though. . . .
and the nice mellow sound..

 

[mattminerDOTcom]

booooooooost

[email protected]

 

[ollie]

2.25 or 2.5 max on a NA car.
3" on a boosted car.
3" on a NA car sounds like a mosquito with a 9 foot wingspan coming your way! :lol: