not all knock is audiable and even the car sometimes cant hear some of the detonation. The reason Red prob made the chip allow the car to rev to there is that his isnt really tuned to your car, just your injectors and octane - this allows him to sell the chip to someone with ported heades, a new cam, etc..(things you need to effectivly rev to 6k) or to someone with a bone stock car with the same chip. Turbo Tweak chips are made based on your turbo, injectors, fuel pump, intercooler, etc... to give you a much more personalized tune. (Not bashing Red's, just showing the difference) Please read the boards and ask questions and spend lots of time at gnttype.org, it makes a word of difference. Also, from my experience, shop around and see what everyone else is buying and see if that is the same thing coming from Poston - I used to buy from Poston and the prev owner jsut threw the Poston catalog at my car - most of that has been removed for better quality parts.