Ok i have a good understanding i think of M90 porting, but i have seen so many diff things done. The GTP i parted out years ago had an ebay m90 the kid bought. it was ported too wide and the two slits were opened up too. have pic below. i have seen others port their blower differently too i think it is the SVT lightning style porting... i understand it is important to keep the outlet the same angle as the rotors... as this just makes sense.
im thinking the slits on either side of the main outlet are what people call silencer ports... i have a pic on my computer where someone machined a drop in piece of aluminum to block these... what would this benifit?
