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Old 07-21-2003, 04:08 PM   #1
Scooby Newbie
Member#: 38532
Join Date: Jun 2003
Chapter/Region: South East
2004 Subaru WRX STI
WRB w/ Gold Rims

Default Intake/DP/Exhaust ?

First off... I know jack about how all of this stuff works and what most of this stuff means.

This is what I have pieced together so far though....

My first investment in my STI will be a Blitz SUS Intake. After that I know I need to do something with the "plumbing" of my exhaust (DP, etc.). I have seen different posts about the STI and its cats, or lack thereof, and don't know what exactly I should be looking to buy next. I know there are two different types of exhaust (turbo-back, cat-back). I know there is such thing as up-pipes and down-pipes. I am not necessarily looking for brand names, but I need to know what I do and DON'T need. Any help would be greatly appreciated.
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Old 07-21-2003, 04:54 PM   #2
Scooby Specialist
Member#: 22998
Join Date: Aug 2002
2004 WRX STi
GT35R 572 whp 93/meth


Up-pipe is catless so you really do not need to change that out. The downpipe has a cat in it and there is one more cat after that. You can replace the downpipe and get a catless one which will increase the speed of the spoolup and make max boost come on a little sooner. For the rest I suggest you do a search and type in what your curious about.
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Old 07-21-2003, 06:06 PM   #3
Scooby Newbie
Member#: 38532
Join Date: Jun 2003
Chapter/Region: South East
2004 Subaru WRX STI
WRB w/ Gold Rims


Thanks for the clarifications!
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Old 07-21-2003, 06:07 PM   #4
Scooby Newbie
Member#: 5227
Join Date: Mar 2001
Location: Rochester, New York, USA

You might want to read this thread before dumping $250 on the Blitz SUS........

Not everyone agrees it is necessary or even a good idea in the first place..........two sides to every story; just make sure you do some research.

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Old 07-21-2003, 06:46 PM   #5
Scooby Newbie
Member#: 39027
Join Date: Jun 2003
Location: Laurel
04 sti


would the dp help keep the turbo spooled up longer? what would?
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Old 07-21-2003, 07:05 PM   #6
Scooby Newbie
Member#: 37344
Join Date: May 2003
Location: Jax
04 WRB STI 04'


Spooled up longer? A bigger turbo would solve that, however that is another big thread. Downpipe would make the turbo spool a wee bit quicker however. With dp, exh, and Blitz sus filter, i got 281.1 on the dyno on a hot day.
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