California Model Jet Ski

I recently moved from Blyth, California to Lake Tahoe, Nevada and I am enjoying the really cool ride spots in my new area. My friend and I both have Yamaha GP800's, but his is a lot faster than mine. Both our boats are totally stock. My friend says mine is a California model, something about emissions or something, what gives?
Jerry

Jerry, Haven't seen any difference in a California model in regards to performance. But, If your friend bought his Jet ski in Tahoe his might have came with a high altitude impeller which would have better performance.
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