Wastegate issues
#24
#29
I know you want to maximize the flow, hence the 5" but with a turbo, you have to balance the flow if you're trying to control the boost (aka control power level). No point in having huge exhaust (5", enough for probably 1500hp) if you only want 700hp. You can try getting a 5-3" or 5-3.5" reducer and just band clamp it to the end of your tailpipe and find out what it takes to control the boost. Then once you figure that out, find a place to put that hidden in your 5" tailpipe. It's sound weird that you're actually trying to reduce your tail pipe, but that's what it take to control your power level, right? Otherwise, you're just trying to make all the horsepowers!


