Im looking for info on the FULL GT series turbos- how do they work compared to what you had? Am I wrong to say the GT compressor and exhaust are only 4 bolt turbos? I thought i saw were precision will or did? make a housing to adapt to a three bolt? Ive looked at the garrett and precision sites but I dont understand the different sizes-37a,37s? I want to know if there is a close turbo to a 45A-{66mm}??? Ive heard great things about this turbo but not real crazy about a 3600-3800 stall speed.