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08-22-2004, 02:25 PM | #1 |
Scooby Newbie
Member#: 64622
Join Date: Jun 2004
Location: Sushi Bar
Vehicle:04 USDM twinscroll Hot Pink, fully riced out |
Gut the OEM STi DP
Has anyone gutted the OEM Sti DP? I was thinking about doing so since I now have my twin scroll on and a cat back. The only thing I was affraid of was a CEL.
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08-22-2004, 02:50 PM | #2 |
Scooby Newbie
Member#: 66850
Join Date: Jul 2004
Location: TURBOTRIX
Vehicle:04 green'd STI 11.41 @ 117mph 93 oct. |
there isnt any cat in the oem DP
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08-22-2004, 04:14 PM | #3 | |
Scooby Specialist
Member#: 61586
Join Date: May 2004
Chapter/Region:
W. Canada
Location: Alberta
Vehicle:2005 STi WI and all the goodies |
Quote:
There are 2 cats after your turbo. One in the dp proper and one in the mid-pipe. If you gut the cat you'll get a CEL (low cat efficiency). You can get a CEL fix by wiring around it (Perrin has one) or going with a bung that has a small amount of cat material in it (godspeed does a nice one). -J |
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08-22-2004, 04:18 PM | #4 |
Scooby Specialist
Member#: 2468
Join Date: Sep 2000
Chapter/Region:
South East
Location: JAX
Vehicle:08 RS4 05 STi - Gone |
carguyx - I believe you are thinking of the stock STi uppipe.
BistroSTi - PM V6turboTA. The WRX and STi downpipes are the same. He put a gutted WRX pipe on his STi for a decent gain. IMHO, you are much better off purchasing a bellmouth or divorced downpipe to free up the wastegate exhaust flow. You have a $30k car. Evidently you also have STi suspension parts (per your profile). Don't cheap out now. |
08-22-2004, 08:48 PM | #5 |
Scooby Newbie
Member#: 64622
Join Date: Jun 2004
Location: Sushi Bar
Vehicle:04 USDM twinscroll Hot Pink, fully riced out |
I have a 04 Sti and I have the JDM twin scroll turbo kit on it. The JDM DP is already a bell mouth, but is a bit diff than the none twin scroll bell mouth so after-market DP's are rare and expensive to import.
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08-22-2004, 09:04 PM | #6 |
Scooby Specialist
Member#: 48380
Join Date: Nov 2003
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i used to use a gutted stock wrx down pipe. ran great.
do it its real easy if your a VERY good welder |
08-22-2004, 09:19 PM | #7 |
Scooby Newbie
Member#: 64622
Join Date: Jun 2004
Location: Sushi Bar
Vehicle:04 USDM twinscroll Hot Pink, fully riced out |
did you use the CEL fix?
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08-22-2004, 09:37 PM | #8 |
Scooby Specialist
Member#: 48380
Join Date: Nov 2003
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yes i did. its also very easy and only cost me 2 dollars at autozone.
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08-22-2004, 09:42 PM | #9 |
Scooby Newbie
Member#: 64622
Join Date: Jun 2004
Location: Sushi Bar
Vehicle:04 USDM twinscroll Hot Pink, fully riced out |
did you just add a inline resistor?
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08-22-2004, 10:02 PM | #10 |
Scooby Specialist
Member#: 48380
Join Date: Nov 2003
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i took two anti fouling adapters and drilled out on and screwed it into the other one then took the sensor and screwed it into the two adapters. Then took that and screwed it into the 3rd cat.
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08-22-2004, 10:05 PM | #11 |
Scooby Newbie
Member#: 64622
Join Date: Jun 2004
Location: Sushi Bar
Vehicle:04 USDM twinscroll Hot Pink, fully riced out |
eh,got a picture?
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08-22-2004, 10:07 PM | #12 |
Scooby Specialist
Member#: 48380
Join Date: Nov 2003
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theres a DIY somehwer on here im sure. it has details and pictures. or try scoobymods.com
or wrxfanatics.com (diy database.... we need one here) |
08-22-2004, 10:14 PM | #13 |
Scooby Newbie
Member#: 64622
Join Date: Jun 2004
Location: Sushi Bar
Vehicle:04 USDM twinscroll Hot Pink, fully riced out |
got a link can't seem to find it
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08-22-2004, 10:22 PM | #14 |
Scooby Specialist
Member#: 48380
Join Date: Nov 2003
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08-22-2004, 11:10 PM | #15 |
Scooby Guru
Member#: 9090
Join Date: Aug 2001
Location: < of Boston
Vehicle:09 Forester Gump 02WRX->04STi->09Gump |
If you want to check out what it could sound like check out the video I posted. Thats the gutted DP and 2nd cat (3rd cat off wrx) with my ghetto axle back. http://forums.nasioc.com/forums/showthread.php?t=604205
With just the cats hollowed it does pull nice, but it smells like hell. If I was to do it again I might just do the downpipe. I still have my stock 2nd cat so I can just throw it on to try it but im lazy. I have the stock muffler on it now and I like it the way it is. Its pretty much like stock, but much deeper. I did NOT cut my downpipe up to gut it. I just bashed the insides to pieces and pulled it out slowly but surely. Same with the 3rd cat. I still have yet to run any impressive numbers with it tho... ~v6 |
08-22-2004, 11:14 PM | #16 | |
Scooby Specialist
Member#: 48380
Join Date: Nov 2003
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Quote:
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08-22-2004, 11:20 PM | #17 | |
Scooby Guru
Member#: 9090
Join Date: Aug 2001
Location: < of Boston
Vehicle:09 Forester Gump 02WRX->04STi->09Gump |
Quote:
You will probably need a prybar and a hammer, or a BIG screwdriver or something like it. Also you will get a CEL with it hollow unless you do the anti fouler CEL fix. (My CEL hasnt come back on in about 500 miles since the CEL fix, but I am told it still will occasionally pop up from time to time.) That fix is simple, cheap, and fits on the STi like a glove ~v6 |
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08-22-2004, 11:15 PM | #18 |
Scooby Guru
Member#: 177
Join Date: Aug 1999
Chapter/Region:
NWIC
Location: Austin, Texas, USA
Vehicle:The 93 W/EJ20K-sold Subaru-less :( |
iirc the sti DP cat is bigger than the WRX DP cat... but the point is moot
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08-22-2004, 11:18 PM | #19 | |
Scooby Guru
Member#: 9090
Join Date: Aug 2001
Location: < of Boston
Vehicle:09 Forester Gump 02WRX->04STi->09Gump |
Quote:
Not sure if its a better or worst thing once its hollowed out. ~v6 |
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08-22-2004, 11:45 PM | #20 |
Scooby Newbie
Member#: 64622
Join Date: Jun 2004
Location: Sushi Bar
Vehicle:04 USDM twinscroll Hot Pink, fully riced out |
nice clip, i'll post a vid up as soon as I have mine all done. I can't wait to hear it as the twin scroll header will delete the boxer sound.
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