Thanks for letting me know about the pipe chap, I'll no doubt contact him and see what he can do.

I've tried a few different sets of pipes on both the standard bore NS's, the 444 and 475 big bores and found out that a pipe that peaks at anything much over 10500 - 11000 rpm simply shifts the curve over to the right and makes not much more power than it would do at 1000rpm less with a lower peaking pipe, lower revs are also kinder to the crank. The NS front two cylinders fire at the same time so would struggle to spin up as fast as a 250 twin and the portings a little more old school than the NSR's.

A pipe that peaks at 10500 will rev on to 11000 and drop back in the power at 9500, (especially with programmable ignition fitted) the NS is also very torquey when bored out and even more so with the crosser barrels fitted as they are ported as standard for more low down grunt than a road race barrel.

The chap at the dyno I use still can't get his head round the 475 power curve, he said it looked more like a tuned SV650 and made as much torque as the tuned R6 he'd just set up, except that was reving to 16-17000rpm !

Cheers Ian