Stock si exhaust piping size? - 8th Generation Honda Civic Forum
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Old 02-24-2008, 07:08 PM   #1 (permalink)
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Stock si exhaust piping size?

is it 2.5?
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Old 02-24-2008, 07:20 PM   #2 (permalink)
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I just measuered the ID of the stock exhaust (where it meets the cat) and it is 2 and 1/16 inches (or 52.3 mm).

Most upgrades are 60 mm.
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Old 02-24-2008, 08:02 PM   #3 (permalink)
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I think the OD is 2.25".
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Old 02-24-2008, 08:11 PM   #4 (permalink)
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Just took a look at the factory axle-back and the pipe is significantly larger. It's hard to measure because of its awkward flange. It also bottle necks at the flange so it wouldn't be a good measurement anyway.

So, B-pipe = pea shooter ~2 inches

axle-back = what looks like at least 2.25 inches, maybe more

^ID, not OD.

This is from a sedan, BTW.
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Old 02-24-2008, 10:20 PM   #5 (permalink)
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Originally Posted by PR_S14 View Post
So, B-pipe = pea shooter ~2 inches
Hehehe, pea shooter. I haven't heard that one in years.
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Old 02-24-2008, 10:22 PM   #6 (permalink)
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i measured when i put on my header
its 2.25"
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Old 02-24-2008, 10:27 PM   #7 (permalink)
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i measured when i put on my header
its 2.25"
No its not. Off the mainfold (cat coverter part) is 3.5" at the opening. As it moves down the cat converter towards the B pipe it tapers to 2" at the end of the cat converter section. This width stays the same from there on back.

I made my own testpipe for this car, I know its ends and outs.
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Old 10-11-2009, 04:54 PM   #8 (permalink)
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so is it 2inches?
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