Couple of suggestions....
Don't forget to tell your insurers about all the changes from standard that you've made. Otherwise you'll no longer be insured most likely.
When you're taking the rear sub off take lots of pics of every stage so you don't miss anything out or re-thread the loom in wrong on re-assemble.
I've got a Fuel on my K3 - sounds 'wicked' according to my biker sons. It certainly turns heads
