Ok... I do most of my own work on my car, 01GT. Have the basic bolt-on's, pulleys, cold air, Flowmasters. I just recently put on a BBK offroad Xpipe and have noticed that I have a lot of exhaust smell and also some blackish smoke.. I had it in the shop (warranty stuff, which they cancled because of the bolt-on's) and the guy said that my # 2 and #8 coil were out. No missing or backfiring. I am wondering if this has anything to do with it?I have also gotten some bad gas a few times in town. Used an additive to dry it out. HELP!!! My pony seems sick...A friend last night told me it could be my rings... ahhhh...