???
No need for bigger injectors unless u're going after big HP like 200RWKW+
Bigger Brakes? - R32 Type-M brakes are almost identical to R33 brakes.
RB25Box I can understand this cause the RB20DET box has problems with big HP.
RB25Engine? - mate its only 27kW or so diff between the two DET engines and the 32 is a slightly lighter car.