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Old 04-20-2007, 10:04 PM   #1
rice h8r
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Question Exhaust piping diameters for STi, WRX and FXT OE exhausts?

I searched but I couldn't find anything specific. I remember reading that it's like 2.23" but others are saying it's 2.5" for the STi. Also it's the same for 06/+ WRXs and that FXTs have a 2.5" mid pipe leading to 2.25" at the axleback...
is this all true?

thanks in advance. I wish there was a stickie or something for this info.
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Old 04-21-2007, 08:50 PM   #2
rice h8r
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no one knows?
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Old 04-21-2007, 10:55 PM   #3
REX8
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Quote:
Originally Posted by rice h8r View Post
I searched but I couldn't find anything specific. I remember reading that it's like 2.23" but others are saying it's 2.5" for the STi. Also it's the same for 06/+ WRXs and that FXTs have a 2.5" mid pipe leading to 2.25" at the axleback...
is this all true?

thanks in advance. I wish there was a stickie or something for this info.
I guess we just use 2.5 and 2.25 to save time. But the diameters are smaller than that.

I measured a little under 2.4" last time for the STi/WRX midpipe and STi axleback.

I'm guessing its about 60mm tubing for the WRX (and STi) midpipes, and the same 60mm on the STi axleback. The WRX axleback tapers from 60mm to about 55mm.

I'm pretty sure the FXT shares the Impreza's 60mm tubing for the midpipes, etc. I imagine the axleback tapers as well to about 55mm.

IIRC: People used to quote the midpipe/STi axlebacks as 62mm tubing. Which very well may be correct. In any event, its about 2.4" maybe a little under.

Last edited by REX8; 04-22-2007 at 12:03 AM.
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Old 04-21-2007, 11:21 PM   #4
Boxer112
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damn, that really sucks for exhaust flow
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Old 04-21-2007, 11:56 PM   #5
k mier
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2.36"-2.38" or ~60mm on the STI, at least that's what I measured. Makes since, we build a lot of oem 60mm exhaust for several different manufacturers.
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Old 04-22-2007, 12:11 AM   #6
rice h8r
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thanks for the info!!
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