Originally Posted by tabetha

I don't find the .48 lacking at the top end, not terribly so anyway.
I must admit when I had £300 worth of porting done, it made a HUGE difference to power above about 5500, pulls hard all the way to the softcut at 7300rpm(hardcut 7600), was well worth £300, improved everywhere, as head as std is a bit of a disaster.
tabetha