What is a really high quality Cold air intake system, throttle body spacer and performance chip that also fixes the tire size and speedometer? Do you need to install an entirely new throttle body in order to put a spacer in or can i just throw a spacer in??? Im gonna be runnin 37'''s so i need to make up HP and this is a start, including the re-gearing. I dont mind spending the money just as long as it the good stuff. Give me your opinions!!! Also how much for a high quality rear locker? Preferably electric...thanks everyone!