I HAVE A 2K3 5SPD FOCI THAT HAS AEM CAI, SUPERCHIPS AND CUSTOM EXHUAST WIT 16INCH TIRES AND IT RUNS 15.5 IN THE 1/4 AT 89.9 MPH THE TEMP BEING 52 F. AND I SHIFT AT 6150. MY QUESTION TO YOU IS SHOULD I KEEP PUTTING PERFORMANCE ON OR JUST GO BUY A 04 MACH 1. AND I DRIVE THE SHIT OUT OF MY CAR AND ITS HAD A HOLE NEW TRANNY PUT IN IT AND LINKAGE AT 8500 MILES. IF I WAS GOING TO KEEP IT I WOOD BUY A MAFS, INTAKE MANI. LONG TUBE HEARDER WITH 2.25 FLEX UDP, CAM GEARS, CRANE CAMS , 65 MM TB AND PORTED AND POLISHED HEAD FROM NAYLOR MOTORSPORTS THEY TOLD ME THEY WOOD BEAT NE ONES PRICE SO I WOOD GIVE THEM A SHOT. THANKX