I have very light experience with gen 4 ls tuning but my buddy recently got a 2017 Camaro SS that has full exhaust with headers, and a rotofab cai. The car has some sort of tuning bc it is catless and doesn?t have a cel. What small changes can i make to the tune? i did ghost cam on my gen4 and idle spark advance to make it sound like gunshots on decel above 2000 rpm or so. thanks in advance.