About a month ago I sent the head off my 11xc 250 down to the guys at
http://cycleplayground.com/ to have them modify the head for more low torgue without sacrificing the topend and to reset the squish to 1.25mm. Now that I've had some time to evaluate the mod I can say for sure that they gave me exactly what I asked for. The bike now has more lowend torque and I'm able to keep the bike in 2nd and 3rd gear now going around tight corners. Where as before the head mod I would have to down shift before entering in order to pull through some of the really tight stuff. I would say the bike is now able to pull 1/2 gear higher in any given situation than it was before the head mod. This was achieved without the loss any topend over rev, just like I asked. I was very impressed. This mod alone has made a bigger diference than any pipe I've tried and is well worth the $60 it cost to have done. I'm very happy with this mod and they will be recieving the head off my 07' Honda cr125 soon.