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Get an inline fuel reducer, check your heads for squish, some 03's were right out to lunch, you need .058" of squish when finished. Try a 2.5 timing key, all for under 100.00 bucks.
If you wanna spend more there is a lot to cut in the ports on the 03 and a clutch kit will help considerably.
 

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Not to sound like a smart ### but how about riding it for a while stock. That way you get a feel for what that particular sled might need as far as mods. Each sled is different.
 
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