Do I need a re-tune?
07-08-2011, 10:00 PM
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Do I need a re-tune?
I bought a 2009 Cobalt SS/TC about 3 weeks ago. The previous owner do a Trifecta tune for it and that is the only non stock for the car. I want to install a downpipe (w/o cat) to start with the mods, but I want to know if I need a re-tune or I can simply install it and keep the current tune?
07-09-2011, 12:08 AM
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if u leave the rear o2 unplugged it won't throw a code, I have had my catless dp on for a little over a month now and have never pluged the rear o2 back in and no code,
07-09-2011, 12:23 AM
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07-11-2011, 05:02 PM
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