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Proof is in the drive! After first installing my 5 Star Tune 2 years ago I was still not getting engine braking downshifts (factory problem that required having ECU reflashed), called 5 Star and they sent another tune to correct the problem, no charge!
After 2 years I would not go back to the factory Tune!!! Acceleration, shifting, and believe it or not, better mpg by about 0.5. I put about 2500 miles on my coach prior to installing my Tune, difference was night and day. Worth every penny and then some!!!
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