I have -06 SD 550x and I am planning to race it. I have already Slp ski´s, very good clutch kit and good setup for carburators also. Back wheels are changed to 4-wheel axel etc, I have 440x brake disc, 1,5" track and -06 440x stock shocks. I am planning to put rail reinforcemets also on it, what do you think? Is there any weak points on the sled to be reinforced? Any ideas are welcome!!