The person tuning the car is far more important than the hand held unit used to load the tune into the computer. I have had great results with my Predator tunes from RWTD (as have many), and just as many have had great results with SCT tuners.
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1998 Mustang GT Coupe - World's Slowest Racecar
2005 Toyota 4Runner SR5 V8
2013 Volkswagen Jetta Sportwagen TDI
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