I couldn't find the build date on it. But the digit says 03. When I tried to look up on a dealer page for part numbers the first 3 serial numbers weren't matching. On this sled it is SN1 which made me believe it could be a 01. So I called the nearest polaris dealer, and that happened to be where it was purchased from, to see if they could look it up. They could and said it was built in 01, bought in 02, and it is listed as a 03. Didn't know polaris built sleds 2 yrs in advanced. He also told me to look at the waterpump. If it is on the front then it is either a 03 or 04. Also according to his records the cdi box had a service letter to replace and hadn't been done. Of course there is a time frame on that replacement. thanks for all the info.