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mdvaldosta

It corrects your speedometer for gear or tire size changes, only works on manual tranny cars and older autos

cableguy

if your going to change the gears, instead of a speedcal, get a hypertech power programmer, not only does it do the job as a speedcal, but also removes rev limiter and increases hp and torq. i 'm selling mine since i have to have my car dyno tuned because i'm putting in cams. e-mail me at joetwc727@msn.com only asking $120

jdaniel

NO NO NO, These guys have it all wrong. A speed cal is high performance turn signal fluid thats a lower viscosity for real serious racers. Look into it!