Porting and polishing a forced induction engine is something you do AFTER lots of the easier, less costly and more effective power mods.
Out of the box, there not likely to be any significant variation in combustion chamber volume or flow - and 30+ PSI boost goes a LONG way in cramming cylinders with air without the assistance of smoother runners.
Yeah, you CAN get a little more HP out of the engine by porting/polishing, but it will likely be the LEAST bang for the buck you will see among available power mods...