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Discussion Starter #81
It can... But at altitude we are actually less prone to boost creep because we have a harder time hitting our boost targets.

We are around 12psi for 1 ATM (atmosphere) even though the standard is 14.7psi (at sea level at 59 degrees). Because our air is less dense by approximately 80%, that means the turbo has to work harder to compress that lower atmospheric pressure to hit the same goals.

When my car was on a vf39 I had 19psi at sea level (California), and up here I had only 17.5psi.

In Colorado I haven't heard of boost creep on a factory turbo before. It may be possible, but I haven't seen it.
 

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Discussion Starter #83
Sure! Hope I helped a little
 

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not sure about other states but in arizona cars 1996 and newer are not run any more they plug into the osb and test the gas cap and visual for cat if cel isnt on your good to go
 

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catless pipe check engine

One thing to think about when going catless, besides the environmental impact, which is obvious, is that it is against federal EPA regulation to knowingly remove the catalytic converters from a vehicle. I believe the fine is up to $50k now for a service center that removes it and $15k for the owner of the vehicle. For me, that's enough to go catted.
New to the forum, does going catless cause any engine codes or check engine light?:wave:
 

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Did you get an answer on this? I have the same question.
There's multiple threads on this if you dig around...This thread is old
Depends on the car. 3rd gens are prone to boost creep but if you're properly tuned for you won't have issues. If you happen to have a 3rd gen and use the accessport to tune for a catless DP you will have issues.
 

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If you happen to have a 3rd gen and use the accessport to tune for a catless DP you MIGHT have issues.
Fixored. It's not guaranteed to have issues...you have a much higher probability for them though...
 

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Fixored. It's not guaranteed to have issues...you have a much higher probability for them though...
Thanks. Forgot It's hit or miss with them
 

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In california they do test NOx, but they test you at 15 and 25mph.

In Colorado we have a full dyno test that is variable, and includes acceleration under load on the dyno. They accelerate several times up to 60 mph during this test which takes up to 5 minutes.

The state inspector advised me that he has had several modified vehicles still fail NOx while tuned for E85.
Colorado Springs doesn't have emissions. Thank god.
 

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Currently 2000 + vehicles in California don't get tailpipe due to new DAD system. Obd2 check/visual/smoke test. If Obd don't pick up any Nox problems than Nox is not a worry. Not to mention the change recently where your only allowed 1 monitor down and evap only one allowed down.99 and lower still get smogged on bar 97.know cause I'm a CA smog tech.
 

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Sorry for bringing this old thread back up but I was wondering if I just change the downpipe back to stock oem then will it pass smog? Also does it fit without brackets of any kind? I think the car I just bought has a 3" exhaust system. If anyone could help I'd greatly appreciate it. I just bought a 06 wrx wagon.
 

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We have a different but related issue: '04 WRX with aftermarket Borla header and exhaust. It has always passed CA smog before, but now the CA Air Resources Board is apparently cracking down - aftermkt equipment has to be CARB certified and smog shops have to check. Although my system fits any WRX from 2001-2016, it is only certified by CARB for 2001-2003. Borla couldn't offer much help. Any ideas? Not looking to spend a lot or make major mods to a 14 yr old car, even one this good.
 

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We have a different but related issue: '04 WRX with aftermarket Borla header and exhaust. It has always passed CA smog before, but now the CA Air Resources Board is apparently cracking down - aftermkt equipment has to be CARB certified and smog shops have to check. Although my system fits any WRX from 2001-2016, it is only certified by CARB for 2001-2003. Borla couldn't offer much help. Any ideas? Not looking to spend a lot or make major mods to a 14 yr old car, even one this good.
 
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drdark9
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