About two years ago i dyno'ed at jdm, 398hp and 499tq. I ran 12.7 for two years consistently with a 4lb, chip, cai, heat exchanger, silver bullit,90mm. Since then i added jdm electric fan, FULL exhaust 2.80 upper, phnolic spacer; and my non horsepower mods were 58" long t bars instead of the lakewoods, and went with 16x10 bajas and 28x10 hoosiers instead of the mickey t's. I have a 99 and upgraded to 3:73 as well. If i can pull 12.3 to 12.4 consistantly i'd be very happy. Thanks for any info.