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Old 11-04-2001, 11:14 PM   #1
avonrex
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Member#: 10014
Join Date: Sep 2001
Location: Colorado
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2002 WRX

Default Dead horse beating

My plan of the week is as follows - I'm looking to put together a decent 2.5"exhaust. I'm going to get a Vishnu uppipe, Scoobysport downpipe, muffler, and rear pipe/resonater pipe (or whatever it's called this week) so that leaves me with the stock front pipe/midpipe with the highly restrictive cat that will hopefully not throw any CELs (I'm at 8000ft if that makes any difference).

1) Is anyone else running a similar set up if so what are your impressions? CEL issues?

2) Is it pointless to get a 2.5" midpipe with a high flow cat? Pointless meaning will a highflow cat give me much more performance gains than the stocker.

3) Does anyone even make one with correct bolt patterns? If so who?

Any feedback on this plan would be greatly appreciated...except arguements about the advantages of 2.5 vs. 3.0".

Ben
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Old 11-04-2001, 11:54 PM   #2
SuperFreq
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Platnum Silver Metallic

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This is a very confusing post. Let me get this straight. You are getting an up pipe, a downpipe and a cat back and leaving the stock midpipe section? My suggestion to you would be 3" turbo back. If you are going to do it do it right. I am running a BPM turbo back with no cat in the downpipe and a high flow cat in the mid section and it runs great! I would suggest replacing the mid section because the midsection will be a bottleneck in your system. I believe that the scoobysport downpipe is 3" as well as the cat back section. Don't waste your money just get the full system and be done with it. 3" has better flow than 2.5" it makes a big difference on a turboed engine. If you live near Boulder I'll take you for a ride and show you the difference .
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Old 11-05-2001, 12:03 AM   #3
LttLDGN
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couple pointers...

uppipe is more likely to cause CEL than any turbo-back exhaust...

scooby sport downpipe will negate the factory cat... it would be the one right after the turbo... this will cause a CEL.... maybe..


suggestions..

i'm not sure at what elevations the computer starts displaying a CEL for the hi-flow cat... check up on those...

i would advise with going just with a turbo back 3" system...

or if you just want the sound and looks, with minimal performance gains, get a cat back system or just the muffler...

cel's can be eliminiated... just got to use resistors.. heheh

IMHO, this custom system would not be worth your effort/expense ... get a 3" turbo back or just a muffler... the uppipe.... i don;t know too much about... heheh
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Old 11-05-2001, 01:26 AM   #4
Austin
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Location: Western Wa
Default Re: Dead horse beating

Quote:
Originally posted by avonrex
My plan of the week is as follows - I'm looking to put together a decent 2.5"exhaust. I'm going to get a Vishnu uppipe, Scoobysport downpipe, muffler, and rear pipe/resonater pipe (or whatever it's called this week) so that leaves me with the stock front pipe/midpipe with the highly restrictive cat that will hopefully not throw any CELs (I'm at 8000ft if that makes any difference).
There are three cats on the car. Doing what you said above will get rid of the first two cats and leave the third one. The rear O2 sensor is placed just in front of the third cat, so you will have a grand total of ZERO cats between your o2 sensors. You get a cat efficiency CEL when there is not enough difference between the front and rear o2 sensors. You will have no difference, so you'll most likely have a CEL with this setup.

ScoobySport components are 2.5", not 3".

Ken @ RallyPerformance.com sells the front midpipe for around $175. Might as well go all the way.

FWIW, Mike Shields said that the stock downpipe has quite good flow, and will flow fine up to 280hp.
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Old 11-05-2001, 02:25 AM   #5
HOK
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Are we racing yet?

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"FWIW, Mike Shields said that the stock downpipe has quite good flow, and will flow fine up to 280hp."

REally? i saw those pictures of the downpipe and they looked pretty boggy...

How is Mr. Shields doing...?
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Old 11-05-2001, 03:03 AM   #6
avonrex
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I was thinking that the rear O2 sensor was behind the third cat. So I guess there is no way to avoid a CEL without the resistor fix. Which in my opinion is not that big of a deal.

The other thing I was hopeing to do was keep at least one cat in there in an attempt to pass emissions. So I figured that if I had to keep one I would keep the one that is located where the majority of cars have their cats. So if I was pulled it would be easy to point out to the osiffer of the lawr if there were any questions. And if I was to keep one I wanted to keep the least boggy one

So I guess my next questions would be do I have a chance in hades to pass the emissions with just that one cat? (SuperFreq do you know anything about CO standards?) If I can pass would I be better off (performance wise) with a high flow cat over the stocker? I did a little more searching and researching and confirmed that the Scoobysport is interchageable with the stock set-up which makes switching a little bit easier if it has to be done.

Thanks again for your help.

Ben
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Old 11-05-2001, 08:36 AM   #7
Austin
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Default

Yes, all scoobysport components are exact replacements for the stock pieces, so it would be easy to replace the stock cats if the need should ever arise.

About that third cat... This is from an email Mike sent me:

Austin,

The stock down pipe (large cat) will flow 280+ hp and is not a restriction on our pump gas. There is no need to replace this part under normal road use. People may tell you otherwise, but it is also your money into their pocket, go figure.

We use 2.5 inch pipe on our exhaust because it will flow 280+ hp, but more importantly it flows with higher gas velocity at lower power outputs and at lower rpm ranges than a 3" pipe. We will explain why this is important in a moment. We do replace the 3rd cat (the one with o2 sensor) to improve flow, as it is the restrictive part of the system, along with the muffler unit.

My roommate talked to him about a week ago and ordered a MOMO steering wheel... he's doing good, not going out of business, just scaling back a little.
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