when you fly a plane with a MVVS or a Evolution 58 on a pipe that is set up rite you become spoiled.the throttle response is so crisp.
Hughes, i just put a new piston and ring in my 58. also went from a 12" header to a 15.5" at the same time and the midrange is a lot better, no peakiness at all.but i went from 7500 on a Biela 24-8 with the 12" header,to 6900 on a NX 24-8 with the 15.5" header.this is with the first tank of fuel.