Mail Order Tune or a Custom Pro Dyno Tune? Maybe this will change your mind.
Will Harlee's 2011 GT has a UPR O/R X-Pipe and came to us with a mail order tune that was good for 385HP and 382TQ. Our Pro Dyno Tune was for 417HP and 406TQ!
Plus A/F Rations were off!
Mind made up yet?