2015 sxt/rt 5.7 with scat pack kits 1 &2
the stage 3 heads are the same as stock just cnc machined for better flow, good for about 20-25 extra ponies at the very leastYep, your right except I have long tube headers and high flow cats with 3" cat back, and it will have a fastman 82mm throttle body. So the only thing missing is the heads which if my info is correct , in 2016 they changed the flow of the stock heads with D port exhaust so the exchange only gains a little on the exhaust, which I have covered with the 1& 7/8 long tube headers and it gives up a little on the intake so it is almost a wash and not worth the money in my estimate. I hope I never got that backwards.
Anyway,if I upgrade valve springs, push rods ect. I am closer to a stage 3 then a stage 2, I think.