Having read of spotty performance from the electronic 'advance' boxes, I went with the 4 degree split-key as you KNOW you are getting what you want. Most definitely improved the low-midrange torque...but may have taken a little away up on top. No matter as I rarely redline the thing but do enjoy the additional midrange power. And a couple mpg's better to boot.What do you guys use to advance timing? DO you use off set timing keys? or is their a computer box that does it? Also how much more timing does the Sv1000 like to obtain max power?