Opening up 450

my uncle recently took delivery of his wr450, has experienced the woodruff key failure and is purchasing a new pipe and ditching the wr boat anchor. i was wondering what other mods he can do to get the full potential out of this bike. i have a 01 wr250 and have done the grey wire, air box, and throttle stop mods to my bike. i was wondering if these mods all apply to the new wr as well. this is his first new bike in over 10 years and i he has been having bad luck form the get go. i know my bike was great after opening it up and i hope the 450s are as well. any help would be appreciated.

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