I had berks installed on my 08 G35XS and didn't drive the car for 6 months( was at the dealer). Dealer installed them, I took the car to drive home and it would buck hesitate and shake. Was dangerous to drive never got a CEL, The dealer had the car for 6 months then was at wits end removed them and put the stockers back on and the car was fine, I even remember call Berk and talking to them. probably was just a bad install or something but don't want to take that chance again, :/ . I had a thread about it over on G35Driver.
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14 Q50 AWD, ARK, ECUTEK (SEB), Takda, 
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