I used one a few years ago before I started modding my car, and I thought it had to be junk because there was no way my car was that slow. Turns out it was pretty much bang on. Many $$$ spent on the car after that.
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Good luck!
Brad R.
1992 L.X. 5.0 coupe
MODS: A few little bolt ons
New Best time ...11.60 @ 128 mph @ 2000+ ft altitude.
Rice Haters Club member #39
Users rides #2542