QUOTE (Paul @ Feb 7 2007, 09:05 AM)

Mine is setup for XC but not completely. Performance wise it just has an HMF slip on, 13t sprocket, no lid, K&N, jetted carb. I have about $10,000 into it with my LSR+1 swinger, Elka LT back shock with Linkage, Elka ST front shocks, Douglas beadlock front wheels, RAZR2's all around, and much more...There's more mods in the sig and if you want I can post some pics of mine just to give you an idea.
If you count the price of your quad you maybe have $10K into it, but theres no way those mods would add up to $10K.
As for the original question, suspension is key to XC racing, but you already know that. Also I would recommend a good set of handguards, a gripper seat cover, and anything else to make your ride more comfortable. Basic performance mods should include a high flow filters and a FULL system. Dont bother with a slip-on, you'll be much happier with a full system. Tires would also be a good investment. Most people swear by razr2's. I personally prefer Kenda Klaw's myself, they clean out better and wont get caked with mud on your first lap. Good luck!