Tuning a Denali 1500XL with 6.2 / 6L80 & MAST 216/230 LSA 116 - what are the expected results street tuning ? this thing is AWD and having hard time locating a AWD dyno . I have a long stretch of highway with slight constant grade - have the manual column shift feature where I can hold truck in gear . Any thoughts would be appreciated - thanks REM