I'm not speaking from experience but I defintely think more than 4/10th for even just minor mods like gearing changes would be in order. I haven't hit the 'official' drag strip but there is a great place to run 1/4's about 10 min from my house. After I changed the gearing, I noticed a nice punch in acceleration just cause I hit peak power faster (shorter gearing) and this in turn quickens my pace. I think lowering kits help keep the bikes center of gravity down thus allowing you to hit the throttle harder....more so on litre bikes than middleweight bikes.
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