Street use for GTR you'd go turbo back exhaust.
An APex'i Power FC with a tune and if you want up the boost a bit but that will depend on the health of your turbos if they are stock / aftermarket.
Then do the cam gears with a tune, if you want to go that far.
Suspension and wheels will help a lot.
Stock Air intake, Intercooler, BOV and Brembos brakes will do you fine until you want to start pushing over 350+ kW's at the rear wheels.
Even then your stock BOV should be fine.