I have an MR-T. First thing to remember these car have no low end torque. Keep the revs above 3500rpm. This helps. when trying to get performace keep the revs up. That being said for under 20K you can build a bullit proof SST/Motor combo that will give you the 600-650 crank horse power you are craving. I had my SST upgraded at Kozmic with clutches, there mods and a dobson pan. I rebuilt my motor with forged internals, cams and ported intake manifold. I added all the normal boltons except using a AMS 750xp kit. Mine make 525whp and works great as a daily driver and is a ball at the track.