well, i am accually just switching out my turbo, the old one had some issues the last year i drove it.. about 2.5 years ago.... it was at full boost in a five speed around 4-4500- 5k max.... it was not bad... but i never really payed attention to what rpm i was at, just for the fact i always watched my air to fuel ratio gauge... i was having problems with my fuel system.... this year however is a whole new ball game, ms will be installed, and new updated fuel system with rail is in the very near future.... cant wait!!!