Stock si exhaust piping size?

Josurf808 · 02-24-2008, 07:08 PM

is it 2.5?

PR_S14 · 02-24-2008, 07:20 PM

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.

Harry · 02-24-2008, 08:02 PM

I think the OD is 2.25".

PR_S14 · 02-24-2008, 08:11 PM

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.

tite681 · 02-24-2008, 10:20 PM

Quote:

Originally Posted by PR_S14

So, B-pipe = pea shooter ~2 inches

Hehehe, pea shooter. I haven't heard that one in years.

loves to speed · 02-24-2008, 10:22 PM

i measured when i put on my header
its 2.25"

XSRCivic · 02-24-2008, 10:27 PM

Quote:

Originally Posted by loves to speed

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.

J808AllDay_Si · 10-11-2009, 04:54 PM

so is it 2inches?

02-24-2008, 07:08 PM	#1 (permalink)
Josurf808 Senior Member Join Date: Feb 2008 Location: Maui, Hawaii Age: 23 Posts: 508 Joseph	Stock si exhaust piping size? is it 2.5?
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02-24-2008, 07:20 PM	#2 (permalink)
PR_S14 Senior Member Join Date: Dec 2006 Posts: 532 Freddy	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.

02-24-2008, 08:02 PM	#3 (permalink)
Harry Senior Member Join Date: Mar 2007 Location: Morgan Hill/San Jose Posts: 4,183	I think the OD is 2.25".

02-24-2008, 08:11 PM	#4 (permalink)
PR_S14 Senior Member Join Date: Dec 2006 Posts: 532 Freddy	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.

02-24-2008, 10:22 PM	#6 (permalink)
loves to speed Senior Member Join Date: Jan 2008 Posts: 209	i measured when i put on my header its 2.25"

10-11-2009, 04:54 PM	#8 (permalink)
J808AllDay_Si Senior Member Join Date: May 2009 Location: Fontana, CA (Kihei, Hawaii) Age: 20 Posts: 2,442	so is it 2inches?

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