I've got one called car performance for my EVO and it seems to be pretty accurate. Went from 2.8x 60' with stock converter to 1.9x with my trailblazer converter. 1/4 mile is around 14.1x which seems to be pretty close for my mods. 5.3 ECSB- LTs, CAI, catback, TB verter, 4.10s, tune, and 32" tires.