2009 Cobalt SS/TC after installing a ZZ Performance catless downpipe. Install was easy as hell -- minus the part where you realize you need a DEEP 15mm socket instead of a regular and have to drive the car to the parts store, get it all hot again, and then burn the shit out of your hand when you immediately start the install when you get home. I am however somewhat dissapointed in the fact I ordered and paid extra ($30) for the downpipe with the O2 sensor elbow that is supposed to prevent the p0420 code from setting. Downpipe has been on for over a week and did finally set a p0420 while sitting in a parking lot idling for a few minutes. Sans the extension issue, the fitment was great and the part is the next best $200 you can spend short of a tune for these cars.
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