I am planning and getting all the parts I need to put a custom turbo on my GSR. I have a Inline Pro Manifold and plan on getting a T3/T4OE 57 trim .63 AR. I need to know which do I get, a 270 or 360 degree? I also need to know if I should get a 4 bolt or a 5 bolt. I want to keep my AC. Thanks for any info you can give.