PutnamCO Posted January 12, 2010 Share Posted January 12, 2010 I failed my CO emissions test yesterday, and am wondering how to proceed. I have a VF52 with an Infamous tune and a fully catless exhaust. I have read to not bother with replacing the up-pipe with the stocker as the cat in the up-pipe does not do much compared to the two in the DP. So I want to put my stock DP back in, run over to the testing facility (about 20 miles round trip) and swap back. Do I need to run a different tune to avoid damaging the turbo since the exhaust will be so much more restrictive? Thanks. Link to comment Share on other sites More sharing options...
enthusiast Posted January 12, 2010 Share Posted January 12, 2010 So what did you do to prepare for the emission test? Did you put the stock DP back on? Change any of the tune? I pointed out in the Mtn West thread about zeroing out the wastegate tables. I can help you with that. I passed with flying colors however, I am running E85. My mod list Link to comment Share on other sites More sharing options...
PhilT Posted January 13, 2010 Share Posted January 13, 2010 Put the stock DP back on, drive slowly and stay out of boost and you will be fine. What kind of test do they do there ? Double Award Winning Legacy GT Wagon Link to comment Share on other sites More sharing options...
PutnamCO Posted January 13, 2010 Author Share Posted January 13, 2010 Thank you both for the advice. I initially did nothing to prepare for the test, and failed badly (2-3X the limit for HC, CO, and NOx). Today, I put the stock DP on, did not change the tune, and got tested again, passing with flying colors. I am driving painfully slowly until I can get the Megan Downpipe back on tomorrow. Out tests seem quite stringent, and are required every two years. Even other CO LGTers with high flow/racing cats have failed. For me it's worth it to take a day to switch the DP out and run catless for two years. Thanks again. Link to comment Share on other sites More sharing options...
ProjectSega Posted January 15, 2010 Share Posted January 15, 2010 Do you have a sensor for the up pipe? I failed visual cuz the cats didn't what they book said. Book said 3 cats (up, upper dp, and mid one). Had to put back stock.... Link to comment Share on other sites More sharing options...
m sprank Posted January 15, 2010 Share Posted January 15, 2010 Your in Cali. Gonna take the "bro" smog check and a couple Franklins to pass without the cats. Even a non stock BPV is illegal here, lol. Link to comment Share on other sites More sharing options...
doctorbrody Posted January 15, 2010 Share Posted January 15, 2010 That's harsh rules. I have to put the stock catback on for Mass. inspection - otherwise I'll fail for noise - but nothing else. My AP v2 passes the OBD-II tamper test - does an open source tune? Link to comment Share on other sites More sharing options...
m sprank Posted January 15, 2010 Share Posted January 15, 2010 yes Link to comment Share on other sites More sharing options...
MDKSDMF Posted January 15, 2010 Share Posted January 15, 2010 pretty sure in mass u cant "touch" your exhaust whatsoever. at least thats what a statie said to me back in 07. funny cause i passed with a catback on my cobalt back then...but then again the inspector had an srt-4 and we were car talking the whole time LOL...think ill pass next month with just a cxlighting cbe and cobb intake? no tune BTW Link to comment Share on other sites More sharing options...
doctorbrody Posted January 15, 2010 Share Posted January 15, 2010 You can have an aftermarket exhaust in Mass, it just can't be any louder than stock. Mine is thunderous - not a chance of passing. I bet if your catback's not absurd you'll be fine. Just takes a few minutes to swap out the catbacks though if you're concerned. No worries on the intake, unless you're throwing CELs. Link to comment Share on other sites More sharing options...
MDKSDMF Posted January 15, 2010 Share Posted January 15, 2010 no CELs. and the CX lighting cat back is pretty hush hush. only when u romp can u tell it means biz. cool. good to know that i should get sticker no problemo. Link to comment Share on other sites More sharing options...
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