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4-cam · 06-06-2014

2 years ago I removed my secondarys and ported the top end and passed the tough IM240 emmisions in colorado with a chip from Cory Henderson. This was a pretty much stock calibration.
I just added headers, magnaflow cats, and 3" exhaust and it failed miserably with the prevoius calibration. I used one of Dominics calibrations and it passed without an issue.
My vote is to remove them but have a good tuner lined up before you get going on the project.

06-06-2014	#6
4-cam Join Date: Feb 2010 Location: Arvada Colorado Posts: 192	Re: Secondaries? Pros and cons? 2 years ago I removed my secondarys and ported the top end and passed the tough IM240 emmisions in colorado with a chip from Cory Henderson. This was a pretty much stock calibration. I just added headers, magnaflow cats, and 3" exhaust and it failed miserably with the prevoius calibration. I used one of Dominics calibrations and it passed without an issue. My vote is to remove them but have a good tuner lined up before you get going on the project.