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Old 06-01-2005, 04:14 PM   #1
Blueboost
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Default sti oem downpipe VS. wrx oem downpipe

Is there any difference between an 04-05 sti oem downpipe and a 04-05 wrx oem downpipe. Does the sti breath better or is it the same setup?
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Old 06-01-2005, 08:51 PM   #2
SuperRuWRX
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An 04 MT WRX downpipe is part #44102FE040
04 Sti downpipe is part # 44102FE170 and more pricey.
IMHO, if they were exactly the same they would probably have the same part #

Richard
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Old 06-01-2005, 08:55 PM   #3
TecHniKa
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stock sucks git aftermarket.
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Old 06-01-2005, 09:33 PM   #4
SuperRuWRX
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Quote:
Originally Posted by TecHniKa
stock sucks git aftermarket.
And may I ask where did you "git" this devine knowledge?

Richard
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Old 06-01-2005, 11:36 PM   #5
Unabomber
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The downpipes are different. The STi one is slightly bigger by 1/4" or so, but the STi one has a bigger catalytic convertor than the WRX, so any gains/losses are probably a wash.
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Old 06-01-2005, 11:45 PM   #6
hondaeater69
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the sti has LEV status UNa?

And also, the UP cat is mainly for startup Conditions, the Main cat is for normal driving, i don't see how the two wash.
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Old 06-02-2005, 12:32 PM   #7
rexster
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also, the bracket that mounts to the tranny is different. the sti downpipe has a shorter bracket that won't line up the wrx. i suspect it is because the sti tranny is larger.
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Old 06-02-2005, 01:04 PM   #8
mbiker97
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Quote:
Originally Posted by hondaeater69
the sti has LEV status UNa?

And also, the UP cat is mainly for startup Conditions, the Main cat is for normal driving, i don't see how the two wash.
The STi is LEV, the WRX is ULEV.
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Old 06-02-2005, 04:49 PM   #9
TecHniKa
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Quote:
Originally Posted by SuperRuWRX
And may I ask where did you "git" this devine knowledge?

Richard
frum aLL mE yEErs off SkooLin mateee aaaaaRRRRRRR
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Old 06-02-2005, 05:59 PM   #10
SuperRuWRX
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Quote:
Originally Posted by TecHniKa
frum aLL mE yEErs off SkooLin mateee aaaaaRRRRRRR
Aye aye! Well shiver me timbers!

Richard
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Old 06-03-2005, 04:48 PM   #11
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Quote:
Originally Posted by rexster
also, the bracket that mounts to the tranny is different. the sti downpipe has a shorter bracket that won't line up the wrx. i suspect it is because the sti tranny is larger.
I just picked up a 05 sti TBE and compared it to my 03 WRX spare TBE and this is the ONLY thing different between the two downpipes. I never thought about the tranny but that has got to be the reason for the shorter bracket which of course will make it different part number.

As for the rest of the system.

3rd cat = Same

Res pipe= same 2.38"ID. Res section is about 2-3" longer on Sti vs. my 03.

Mufflers, Sti is 2.38" ID pipe all the way, 03 WRX starts at 2.38" ID at the flange but necks down to 2.12"ID right after.

These minor differences in the res and muffler pipes could be do to just the year and not the model.
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Old 06-03-2005, 05:29 PM   #12
rankink
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Quote:
Originally Posted by Blueboost
Is there any difference between an 04-05 sti oem downpipe and a 04-05 wrx oem downpipe. Does the sti breath better or is it the same setup?

I don't think you are going to gain much of anything going from the stock WRX DP to the stock STi DP with all things being the same. Both have a big cat that is the biggest restriction. For power increase I would go with a aftermarket DP without a cat or if must have a cat then get one with a high-flow cat.
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Old 06-03-2005, 06:59 PM   #13
Jon [in CT]
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Quote:
Originally Posted by mbiker97
The STi is LEV, the WRX is ULEV.
WRX = LEV according to:
http://vocuspr.vocus.com/VocusPR30/D...d-ed6bc543eb37
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