I have a 1999 ZL600EFI and for this upcomming summer i plan to put a tunnel extension, rail extension and buy a new track. I want my sled to have a 136" track so i could go into powder and just boondock. Im thinking of buying a bigger engine from D&D racing. What would be the best engine to buy that would fit into my ZL. I want to make my snowmobile to grab peoples attension. Im planning of spending 2 or 3 grand on my baby.