Our banshee's just have bolt ons. Mine has the DMC exhaust, boysen rad valve reeds, K&N with an open lid, and it's on the .050 bore.
My fathers has the FMF fatties with powercoreII's, Milled head .028, boost bottle (No he didn't put that on, was on when he bought it) and bored over .030. The motor was put together and tuned by Yamaha, runs AMAZING.
Mine right now is a little faster.
This winter, I plan on buying a new Hotrods crank since this has the original. Stock stroke. Then hopefully if funds allow it, a mild dune port.
Father's saving up for a stock stroke hotrods also because it's starting to get a little noisy.