My 2004 GTO has never run better! This product is very easy to install and use. Programming from start to finish took about 15 minutes, and I had never used a programmer before! I took out the annoying 1-4 skip shift, upped my speed limiter to 169 mph to match my W-rated tires, and performed a Stage One tune. The car is smoother than ever. I haven't done any timed runs yet, but my seat-of-the-pants impression is that power is better throughout the entire rpm band, and the engine doesn't run out of breath all the way to redline. I have a cold-air intake and 3-inch Borla exhaust. According to the instructions, a Stage Two tune would require a colder thermostat, in addition to the upgrades I already have, and a Stage Three tune would require headers. Personally, I feel the Stage One tune is just right for me. And gas mileage doesn't suffer in the least!
Its good to be the King
I purchased a mass air flow with cooling and a air induction kit. I started receiving engine light errors. My dealer would reset the codes and I would go on. Now, I can find the reasons. I also used the customer service for help. I was told how to stop the codes from continuting. The dealer replaced something on my car and that is stoping me from performing my performance tune. I have an appointment to get this concern fixed with the dealer. Then I will do the performance tune. They were so suprised that I knew what the codes stood for.