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Thread: What size exhaust pipe?

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Posts: 1-10 of 16
2012-12-21 09:50:53
What size exhaust pipe?
I am new to the forum and havent been able to find an answer. I have a 91 se-r and i am going to put on headers and straight pipe to a greddy muffler. I got a 60mm inlet would 2.5 inch piping be too big. Will there be enough backpressure?
2012-12-21 09:52:20
2.5" is perfect for N/A
3" for turbo
2012-12-21 10:16:03
I have 2.5" on mine and love it
2012-12-21 10:29:55
Even with no cat?
2012-12-21 10:31:00
Originally Posted by Sentraga
2.5" is perfect for N/A
3" for turbo

Even with no cat?
2012-12-21 10:37:04
Don't run straight pipe, you'll loose power if it's a stock engine(internally).
2012-12-21 10:40:25
Originally Posted by TINNMANN
Originally Posted by Sentraga
2.5" is perfect for N/A
3" for turbo

Even with no cat?

Give this thread a read - http://www.sr20-forum.com/all-motor/53021-straight-pipe-de.html

Here's an excerpt - (Post #17 of the thread)
Originally Posted by Bucky13
I tried the "no cat straight pipe" thing once.It was the quickest way I could find to subtract the most torque. The car couldn't get out of it's own way.Went to a high flow cat with much,much better results.On the dyno,the no cat setup lost about 10 lb ft of torque and gained 0 hp.With the high flow,2 lb ft of torque was gained,along with 4 hp.Just my experience,yours may vary.
2012-12-22 07:25:53
Interesting. On my VE, for exhaust I run a JMR header to a 3" exhaust to magnaflow, no cat at all. The car made 206hp at the wheels on the dyno. It is loud as phuck. Are you guys saying that adding a cat would increase my bottom end? Besides N1 cams the engine is stock.
Last edited by Storm88000 on 2012-12-22 at 07-26-56.
2012-12-22 14:41:02
No. We had an n1 cammed vvl stuck at 196whp. Took out the cat and the car made 202whp, gains were across the graph. No other changes.
Last edited by P10FTW on 2012-12-22 at 14-42-34.
2012-12-22 21:27:20
Thanks for the link Sentraga.
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