Upgradeing exhaust system on bnr32.
Current Mods are : piggybacked ecu, factory boost limmiter taken out so pretty much its a stock car.
Currently upgrading exhaust system from the turbo outlets back... (hks equal leangth front pipes , hi flow cat , hks hi power cat back exhaust)
Question is on r32 gtrs when upgrading these parts do you need a tune along with it or is it a matter of bolt on and away you go.