You upgraded your ride: a new exhaust, ECU tuning, maybe even stickers in the windows. Measuring the effectiveness of a mod can be tricky. Yeah, you could bring it to a shop but nothing really compares to the accuracy of... the Butt Dyno. Feel that rumble in your seat (err, from the car) and you'll know how well that upgrade really worked.
Shirt Color: Military Butt Green
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