CAS wires can be cut & extended if it wont make it around tt plumbing. You can run the TT fuel pump at the NA's dual voltage instead of the TT's triple voltage that comes from a TT harness. This saves you the cost of a new harness ($350), but if you're like me I just didnt want to go through reinstalling my racelogic tc system into a new harness so I'm reusing my NA harness.