you can blow through the fuel lines and reuse them if they're in good condition. you can use your existing tanks after good clean if you fit a lift pump then another inline high pressure type jobby... such as jag lift pump and 306 S16 hi pressure pump. use the complete mk5 wiring loom its for the best unless you want to do lots of splicing and dicing, also if its an early mk6 no pats to disable / bugger around with.

make sure you transfer the brakes over and fit appropriate front suspension or you'll be sorry and possibly dead