UP/DP question - Subaru WRX Forum
 
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#1 Old 11-15-2005, 06:30 PM
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UP/DP question

Sup everyone,

I just purchased a 03' wrx. it already has a Blitz Nur spec exhaust on it and i am looking to get to stage 2 soon. I'm looking at installing a helix up pipe and down pipe to finish off the exhaust but am a little worried about not passing emissions. Will this be a problem or do you guys think i will be ok. i know it is kinda hard to say being emissions requirements are different by location. I live in PA if that helps at all.

Also would there be a better combo than a helix/helix with the nur spec exhaust?

Sorry for all the questions, and yes i am very new at this...lol
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#2 Old 11-15-2005, 07:26 PM
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well first off welcome fellow bug-eye...

If you want to pass emmisions for sure just reinstall your stock exhaust when it comes time to do the emissions...you should be able to get away with just a downpipe cat.

"Life's a bowl of punch so go ahead and Spike it!" -311
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#3 Old 11-15-2005, 07:52 PM
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*hits himself*...man i feel dumb for not thinking of bolting the stock parts back on....LOL

So then, would the Helix/Helix work well with the nur spec cat back? or do you guys think there would be a better combination?
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#4 Old 11-15-2005, 09:56 PM
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that sould work fine. ive got a perrin up/dn pipe with the same cat-back. no problems ecept for the bottom of the bumper burnt!Cry!
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#5 Old 11-15-2005, 10:38 PM
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Many people have the Helix on here. I also have the Perrin... no exhaust burn, but I do have a slight leak because some idiot tried to "do me a favor" my (over)tightening down my turbo-DP bolt.

Jon
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#6 Old 11-16-2005, 01:03 AM
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Anyone care to explain the difference between "divorced" and "bellmouth" in the downpipe?
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#7 Old 11-16-2005, 07:49 AM
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Bellmouth: Just one big opening that takes all the exhaust coming out of the turbo and the wastegate.




Divorced: Two separate pipes that come together later in the exhaust system. One takes all of the exhaust coming from the turbo and the smaller one takes all the exhaust from the wastegate. The divorced is said to make more power because there is less turbulence in the flow of air.
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#8 Old 11-16-2005, 09:49 AM
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So then in theory it would be better to go with a divorced downpipe?
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#9 Old 11-16-2005, 11:51 AM
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Quote:
Originally Posted by KritiKaL
So then in theory it would be better to go with a divorced downpipe?
You can go with both. Invidia V3 D/P I believe comes as a bellmouth with divorced wastegate. So it would be the best but since I don't know anything about cars someone else should confirm this.
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#10 Old 11-17-2005, 07:44 AM
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In theory divorced is better, but the gains would be minimal, maybe 1-2hp. I have a bellmouth downpipe because it was much cheaper then the divorced.
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#11 Old 11-25-2005, 07:12 PM
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Here in PA, 96 and newer cars are odbII equiped, they are tested by hooking up the 16 pin connector and scanning the E.C.M. for codes. on 95 and older cars, they run what is called ASM 50/15 (50% load at 15mph). but even if your car was 95 or older because it's all-wheel drive your car would run a two-speed idle test(2500rpm's then idle). You now can get away(not saying legal) with not having any converters on your car, as long as your M.I.L is not on. And no your can't just take the light out.(Saw somewhere in another post)

Yes I am new to this fourm.
04 Z-car
02 WRX
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