Recently, installed a Marks 4-2 stainless steel exhaust with 14" mufflers on my stock 06 w/o any problems. (Thanks to you Mod Monkey, it?s not stock ANYMORE !!)
Made the recommended changes: 1) set the A/F screws to 3.5 turns out and 2) shimmed the carb needles to 0.038? (used two #4 steel flat...