As of approximately 2/1/12 (200 Optimax and 200 ProXS Optimax with serial numbers of 1B912786 and above)- the 200 ProXS has undergone design changes that included GRAY direct injectors, higher-air & fuel pressures, Carbon Fiber Reeds, and most of the other performance features found on all other ProXS models (including a 3-star Emissions Rating).

It will be important to VERIFY the correct spark plug is utilized in 200 ProXS models because of this (preferably by serial number).

One easy "visual" identifier is to look at the DIRECT INJECTORS:

-With BLUE Direct Injectors: IZFR5G
-With GRAY Direct Injectors: IZFR6J