I have been looking at getting a prox 440. The years I have been looking at are 2001 and 2002. After contacting my dealer they say the low compression head kit is only available from 2002-04. What are people using to convert the 2001 to use 92 instead of 110? From the research I have done and talking to people the chassic are close to the same. Which sled would be a better chose for ditch banging/jumping and a little trail riding? I already know that I will be needing to rejet when temp are changing on both sleds. Which is a better sled and why? I have 2002 xcsp 600 for trail riding that I plan to put a 136 on over the summer but looking for a sled to jump/ditch bang and a little trail riding.