I looked into the RB Head mod shown here http://www.rb-designs.com/ It basically sounds like decreasing the cc of the head to maximize the compression while making sure that the piston does not cotact the head. Looks like the mod involves cutting the head down and then opening it up to match the squish. My question is, it it worth it to do the mod and where will the mod help out? Will it really make a diference? Will it help the low, mid or top range? How much will it affect the jetting? Do you need to change anything else to make the mod work? (For example, porting a cylinder will not really do much without changing the pipe too) It would be nice to here from people who had the mod done with some personel experience testmonials.