dont fear the gear! 4.10, 4.30, 4.56 MANY guys running these. I am going with the 4.30's as its not a DD. the best bang for the buck is the PHP intake spacer IMHO. as well as a cat back, mid pipe, CAI, elec W/P LT,s. and a good tune. these cars have a lean spot in the high end that should be...