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Old 11-28-2008, 09:53 PM   #1
Michel
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General exhaust install and backpressure related question



So I'm looking to exchange my axle back for a stock integra axle back. My current setup is a 2 1/2 " pipe. My first question is what do I need to do to make a stock sized pipe (1 1/2"?) fit my 2 1/2" without cutting/welding? Is it even posssible?

My second question is, will the extra 'backpressure' from reducing pipe size from the axel back affect my engine in any negative way?

Reason I'm asking here and not honda forums is b/c I can't stand the people in honda forums and this is more general since all cars would likely behave in the same way with this adjustment.

Thanks!
-Mike.
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Old 11-28-2008, 11:26 PM   #2
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should fit, i think the flanges are universal size, measure up before u get dirty though.

u will have some head loss in a non smooth transition like that, shouldn't be noticeable though.
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Old 11-29-2008, 01:15 PM   #3
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^Thanks, I will check out the flange sizes... by what do you mean head loss? like a loss in power?
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Old 11-29-2008, 03:37 PM   #4
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Flow loss. You should be OK unless you have crazy HP.
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Old 11-29-2008, 03:38 PM   #5
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you might notice some loss at high rpm. very minor
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Old 11-29-2008, 04:11 PM   #6
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I had a grapefruit launcher on my civic, and I just put on a stock OE style replacement from Napa, and I picked up some midrange punch and don't feel any significant loss at high RPM's. The silence is so nice, I can't hear the motor idling anymore. But the intake is still hella loud with any engine load.
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Old 11-29-2008, 04:54 PM   #7
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^oh good, thats what i'm looking for. I have a pretty much stock h22 so shouldnt be that bad I guess since its not high HP. So assuming that the flanges are same size, should I stick with a 2 1/2" sized gasket?
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Old 11-29-2008, 05:09 PM   #8
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Well, I have a D15B7 with headers and intake, so your mileage may vary. I'd recommend looking at what stock preludes use and try to mimic that setup.
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