Chain breaker
Battery Powered Impact 1/2" Drive
Set of Metric Impact Sockets for Impact Gun
Flywheel Puller
Standard Length Metric Sockets
Deep Length Metric Sockets
Metric Allen Wrenches
Snap-Ring Pliers
Torque Wrench
Bore Scope (If its in your budget)
Feeler Gauges
Metric Open-End Wrenches (I like the ratcheting ones)
These items should be added to your normal toolbox assortment... hammers, screwdrivers, channel locks, crescent, etc etc.
Spend the money on a good impact gun. They have a million uses both on and off the banshee. Dewalt makes some very nice ones. Just be sure you get one of the 1/2" drive ones.