I went and talked to my Serviceman and he told me anything that bolts up directly to the engine or drivetrain could void my warranty. Pulleys, Upper intake plenium, headers, gears, driveshaft, etc all fall under that catagory. I have hi-flo catted x, cat-backs, CAI, and the performance chip. He told me to take the chip out before I bring the car in so when they do diag. on the car, the original settings will be displayed. He's a pretty cool guy. Now, I asked him about gears and he said they do not install them if your original gears are working properly. Now if something should happened to my gears, they would replace them with higher gears and reflash my EEC to adjust for the gear change and still have it on warranty. He said I would have to pay for the upgraded gears and reflash, but after that the rest would be covered and the warranty would still be intact. So I need to find out how to screw up my gears so I can get upgrades and still be under warranty.