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Old 09-11-2009, 07:29 PM   #1
nostra
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Member#: 219274
Join Date: Aug 2009
Vehicle:
2009 STi
DMG

Question STU legal downpipe for GRB STi ?

I'm wanting to stick in the STU class for my new 2009 STi and am trying to get current info on the best downpipe options to consider for a GRB STi. I've seen a number of old threads on the subject but nothing current to consider new products and SCCA rule changes.

Is this only the Cobb DP? Perrin DP? Any specific experience with these working correctly/legal for STU on a GRB you can share? Also, if this rule passes that won't allow ANY custom mapping, does this basically mean getting a downpipe is pointless for STU AutoX as it can't be tuned to work correctly?

From an STU rules stance this mainly effects 4 areas for those that don't know:

(1) inlet of the single replacement converter may be located no further downstream than 6" along the piping flow path from the original exit of the final OE converter.
(2) this downpipe needs to not cause a CEL and mapping cannot be used to keep CEL from triggering.
(3) STU doesn't allow for any change in mapping that affects boost levels (and shortly due to May fastrack submission maybe illegal for ANY illegal mapping)
(4) Heat shield requirements that I can't seem to find right now, but effectively right now requires custom heat shield trimming to be STU legal.

Thanks in advance!
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Last edited by nostra; 09-11-2009 at 09:00 PM.
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Old 09-12-2009, 10:44 PM   #2
nostra
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Member#: 219274
Join Date: Aug 2009
Vehicle:
2009 STi
DMG

Default

From other posts, I assume that a DP like the Invidia and Helix are fine for STU assuming they don't throw a CEL because the replacement high flo cat is further upstream in the pipe than OE so this doesn't violate the following rule:

4) Be used in the same location(s) as the OE converter(s).

This does allow for high performance replacements, provided they meet all restrictions herein.

STX, STU:

Any high flow catalytic converter(s) are allowed, but must attach
within six inches of the original unit. Multiple catalytic converters
may be replaced by a single unit. The inlet of the single
replacement converter may be located no further downstream
than 6"
along the piping flow path from the original exit of the
final OE converter
.
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Old 09-13-2009, 07:17 AM   #3
2superblus
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Join Date: Mar 2003
Chapter/Region: MWSOC
Location: Brookfield, Wi
Vehicle:
2013 WRB W/Gold BRZ
08 STI WRB w/Gold, 02 WRX

Default

You are allowed per rules to modify the heatshield cover the turbo and downpipe for fitment.
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