Your gonna need some sort of
ecu tuning. A unichip or chiptorque may do it, but 170rwkw would most probably need either a Microtech, wolf3d or even an MS2 to take over ignition and injectors.
Youd be needing another fuel pump and some bigger injectors(prob around 36lb)...
19lb injectors will only flow 36rwhp each so maxing out at about 216rwhp. However with a fuel reg others have got quite a bit more than this. But id go the
ecu root if you could afford it.
Sounds great though mate, you must be excited. 170rwkw NA would be a weapon.