i very much agree on GEARS. 4.30s are where u want to be, if not 4.56s. dont let anyone talk u less than 4.10s, or u will kick urself later. and u will want an o/r mid pipe, an X or and H, and some good mufflers. just to give u the sound that should come with these cars stock. as for heads and blocks. YES 99 heads are better, BUT, the blocks for the 96-98s have held more power compaired to the the 99 and 01s. hope this helps.