Ok well the whole exhaust side is going to be re done. Currently the 2.5" twin exhaust merging into a single 3" is just far too big for the power i want even in a compound setup. Just for an example i'm after roughly 400-450kw total in my setup or enough to run a 10.99 at the drags. Nuggetgarage on youtube have a rearmount turbo VH45 supra with a GT4788 making ~1000rwhp on twin 2" pipes and run low 9s. This car does 8.1 @ 170mph and makes ~1200hp with twin 2.25" pipes to a single turbo... Basically the piping size i have on the car at the moment is capable of like ~1500hp . I'm going to go get my front pipes remade in 2" stainless steel and wrap them to see how much of a difference is made. If the difference in spool is noticeable i'll re-do the entire setup to twin 2" to single 2.5" and tuck the intercooler pipe up so its not hanging close to the ground. Another interesting thing to note is charge piping doesnt seem to have to be as large either with a few cars i've found doing ~750rwhp on 2.25" charge piping. I'll be keeping mine 2.5" but i will step it down to 2-2.25 next to the radiator as i want to put the factory radiator and fan back into the car, the Honda stuff is just not cutting it. I got it all that wrong but i still got the turbo on full boost at 4500.