Editing Recommended mods to RB30E (section)

==Porting and Polishing==
Other options after this can include porting and polishing which will can better flow through the inlet and outlet ports.
The GTS2 engines had mild head work performed to the exhaust ports and the GTS1 exhaust ports also look slightly larger on my currently engine than stock.
These will increase the amount of flow that your engine can suck in as well as breath out and will take advantage of a good induction and exhaust system.
I believe the amount of power from this modification is mainly noticeable in the high revs (prob around 5500rpm - 6000rpm) when the air intake / expelling will take advantage of the larger ports.