So I know I may be going against the grain here but... I installed a 4" turbo back MBRP exhaust with the cat delete pipe last weekend, and I can bairly hear the engine over the turbo whistle. I have read that the 03 turbos were a lot louder than the 04/05's. does any one know of a way to quiet down the whistle from the turbo? If not will an 04/05 be a direct bolt on?