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Safe to Drive with Stock Downpipe
Safe to Drive with Stock Downpipe
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Old 04-30-17, 08:32 AM   #1
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Default Safe to Drive with Stock Downpipe

I have a fully built motor, that is SD tuned (IAT in TMIC with no MAF). I put the stock downpipe back on the car temporarily for emissions testing. Is there any considerations that I should keep in mind while driving the car?

I know an aftermarket downpipe on a stock tune will cause a lean condition, but what about the other way around?
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Old 05-01-17, 04:59 AM   #2
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Default Re: Safe to Drive with Stock Downpipe

stay out of boost
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Old 05-02-17, 12:32 AM   #3
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Default Re: Safe to Drive with Stock Downpipe

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Originally Posted by revilingfool View Post
stay out of boost
this. drive nice and gently and it'll be no problem. i have done it 3 times now with the stock DP & my sg2+ map, even getting into boost a little isnt a problem, just dont drive it like normally (no WOT)
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Old 05-02-17, 10:04 AM   #4
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Default Re: Safe to Drive with Stock Downpipe

I managed to pass the following day. Drove it like a Camry there and back. The Invidia is back on he car, and as soon as I put back the TMIC I will be ready to go.

Just an FYI... I have no Smog Pump, no EGR, and no PCV system (replaced with IAG Comp series AOS). Only the EVAP system is intact (partially with only one solenoid). And I passed with only the stock downpipe.

When I took off the TMIC, there was not a drop of oil anywhere within the intake all the way to the throttle body! A big thanks to IAG.

Last edited by 12obsti; 05-02-17 at 10:13 AM.
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Old 05-11-17, 07:43 PM   #5
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Default Re: Safe to Drive with Stock Downpipe

Yo


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Old 05-12-17, 03:30 AM   #6
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Default Re: Safe to Drive with Stock Downpipe

Wow ill keep that in mind next time i have to go for inspection here. Were you ballsy enough to go and get it done at a state inspection site or just at a private shop??
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Old 05-14-17, 07:58 AM   #7
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Default Re: Safe to Drive with Stock Downpipe

Damn so you have to revert to stock-ish every year? That sucks. I don't feel so bad about what we go through. I don't agree with states that have no inspection process at all, clearly this jeopardizes general safety - but I also hate to imagine having to try to revert to stock every year. Hell, even tail-pipe sniffing is one thing, but that's still not as bad. If you can pass emissions with an aftermarket catted downpipe, who cares?

I hate dealing with the evap system. I'm glad it does what it does, but I don't care if there is a pinhole leak. Call me when there's a big enough leak to matter.
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Old 05-14-17, 10:03 AM   #8
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Default Re: Safe to Drive with Stock Downpipe

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Originally Posted by 12obsti View Post
The Invidia is back on he car, and as soon as I put back the TMIC I will be ready to go . . . And I passed with only the stock downpipe.
All you need us the cat. Intercooler doesn't change anything . . . inspection wise


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Originally Posted by murfnamedsmurf View Post
Damn so you have to revert to stock-ish every year? . . . I also hate to imagine having to try to revert to stock every year.
NJ is every other year and the only thing you really need besides proper tuning is a cat. Changing the DP isn't that bad. But I just run a catted DP. Haven't had an use yet. I do keep my fingers crossed though.
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