low flow impellers are better, but the best thing is to leave it out all together if you building a killer traol bike because of the drag on the motor a pump creates, the coolent just cycles natrolley throogh efapperashun
not really any updates but they are selling http://www.ebay.com/itm/NEW-YAMAHA-BANSHEE-350-STANDARD-STD-BORE-CYLINDER-PISTON-GASKET-KIT-1987-2006-/381117616887?fits=Model%3ABanshee+350