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Old 10-03-2001, 12:07 AM   #1
wangerrr
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Member#: 10372
Join Date: Sep 2001
Vehicle:
2002 WRX
Silver

Default BPM twister exhaust

I have recently installed a BPM twister spec turbo back exhaust and was wondering if anyone knew what kind of HP gains I received after installing this. I definatly feel more power and was wondering if anyone has a rough estimate they could give me.

Oh and...my CE light came on a week later. Is this do to the new exhaust?

thanks,
garrett
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Old 10-03-2001, 12:34 AM   #2
The Fly
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Member#: 3151
Join Date: Dec 2000
Location: Hobart, Tasmania, Australia
Vehicle:
1998 WRX
Light Silver

Default

Garrett,

I believe that the BPM GT exhaust is good for about 13-15Kw ATW. I'd think it would be a similar increase with the Twister muffler. This is on the 160Kw Aussie spec car, but it should still be reasonably indicative for your model spec.

Hope this helps.

Scott
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Old 10-03-2001, 10:54 AM   #3
gossamer_monster
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Member#: 3574
Join Date: Jan 2001
Chapter/Region: NESIC
Vehicle:
2002 WRX
Blase' Yellow----R.I.P.

Default

Is your o2 sensor in the correct bung? It should be in the farthest back bung, ie closest to the muffler. CEL could be in related. Have the code pulled and make sure it isn`t something worse.

Good inverstment is a OBD scanner.

I dropped .3 in the 1/4 mile and picked up about 2 mph with just the MKIII addition, on an otherwiae stock car.


Bill
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Old 10-03-2001, 04:57 PM   #4
SuicidalLabRat
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Join Date: Feb 2001
Location: Constantinople
Vehicle:
noun [ ve·hi·cle ]
a carrier,as of infection

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110 octane and BPM MKIII turbo back on the all wheel dynojet at GT Motorsports in LA. This is at ~sea level immediately following a 600 mile drive; no icing the IC etc...





SLR-
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Old 10-04-2001, 02:19 AM   #5
wangerrr
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Join Date: Sep 2001
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2002 WRX
Silver

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Thanks for the info. My sensor plug-in is not in the closest hole to the muffler. The sensor cord would not reach. Do you think this would be enough to trigger my CE light? thanks,
garrett
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Old 10-04-2001, 07:02 AM   #6
Force[FED]
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Member#: 292
Join Date: Sep 1999
Location: Elmer, NJ USA
Vehicle:
2011 BMW 535i
Havana Metallic

Default Stupid question...

and I know I should know this. Doesn't the WRX have two o2s? Is one pre-turbo, and one post cat converter? I notice when people put on turbo-back exhausts they are only talking about ONE o2 sensor (which has to go after the cat). So what is the bung before the cat that some people accidentally install the o2 in? Why is it even there?

Thanks for the help. My BPM MKiii will be here TOMORROW (thanks Mike@Exeter!).

Kevin

www.forcefed4.com
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Old 10-04-2001, 08:34 AM   #7
Mike2003
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Member#: 3245
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Thumbs up

Garrett the o2 sensor will reach Give me a call and I will tell you what you need to do to make it reach. There is no cutting wires involed. 1-877-782-2789.
You are welcome Kevin
Mike@Exeter
www.subaruwrxparts.com
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Old 10-04-2001, 10:00 AM   #8
K-WRX
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Join Date: May 2001
Location: DFW, USA
Vehicle:
2006 Cayman S

Default Re: Stupid question...

Quote:
Originally posted by Force[FED]
and I know I should know this. Doesn't the WRX have two o2s? Is one pre-turbo, and one post cat converter? I notice when people put on turbo-back exhausts they are only talking about ONE o2 sensor (which has to go after the cat). So what is the bung before the cat that some people accidentally install the o2 in? Why is it even there?[/url]
There is an O2 sensor in the RH collector pipe (before the up-pipe) in addition to the one in the downpipe. As I understand it the ECU looks at the difference between the pre and post cat sensors to determine if they are effective (or present). I'm not sure why some aftermarket exhausts (like my M2) have a bung in the downpipe before the cat - unless you want to put a sensor there for some reason.
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Old 10-04-2001, 10:22 AM   #9
Force[FED]
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Join Date: Sep 1999
Location: Elmer, NJ USA
Vehicle:
2011 BMW 535i
Havana Metallic

Default

Thanks K-WRX. I know that one o2 sensor is pre-cat, and one is post-cat (like you said, so the ECU can check for catalytic converter efficiency). But I didn't know WHERE the 1st o2 was located...I thought the first one was in the downpipe (before the 2 cats), and the other was after the cats. Now I know! :P

Thanks,

Kevin

www.forcefed4.com
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Old 10-04-2001, 02:46 PM   #10
APSBLUEREX
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Join Date: Sep 2001
Location: San Francisco, Ca
Default

sup garrett, im assuming ur last name is wang, garrett wang? ur name "wangerrrr" was so funny to me cause thats what all my friends in high school used to call me. obviously, my last name is wang. whats ur location? are you a young scoobie fan like myself (almost 19)? well, anyways, good luck with ur modding.
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