I have the same problem, just got g3's and berk exhaust installed and my car feels quite a bit slower too. it ran great for about 2000 miles now all of the sudden the car feels very sluggish, especially when it's cold out. I figure I need a tune because when it's warm outside it runs much better than when it's cold. anyone got any ideas? was going to start a thread on this but op beat me to it. also my exhaust tips got really black really fast, running rich I presume.
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