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There are many of us who have a crapload of knowledge and experience who will help you solve alm your bike related issues..
I mean I know it wil fit but can I use the k9 ECU and wireloom?
That depends. If you use K9 throttle bodies on the L6 engine, you can. If you swap to L6 throttle bodies, it might run like ass. Whatever gen you use, you MIGHT need to match the airbox to the year. Report back if you take the plunge, please.
I want to use everything from the k9, throttle body, complete exhaust, air filter housing etc.
Everything except the engine block because of the lubrication problems of the crankshaft with the models K9 to L1