Reviewed By Henry K (Spring, TX) Reviewed for a 2009 Jeep Grand Cherokee —7/3/2007 6:56 AM
So far I have only tried the performance tune for premium fuel and am satisfied with the results. I would have liked a 93 octane tune better than the 91 but all is well with my 4.0L Mustang as compared to the factory tune. The tuning time was very short and difficulty factor was very simple. Even a caveman can do it.