Only difference I am aware of is that the Racing version has the option of different gearcases and solid motor mounts are standard. It should be noted that 25 and 30" shaft 250 XSs have been discontinued, if you need that length, you are limited to the production 250 Optimax or 250 ProXS. Plus, the ProXS comes with 5 years of warranty right now compared to 2 years on the XS.
South Florida's Mercury Repower Headquarters!
"On the Reel" - '97 Sundance 26
"The Project" - '89 21 Paramount, 2.4 200 Merc