I've got a Werks B5 .21 with a Dynamite 086 hard anodized pipe, about 2.5 gallons through it, always tuned with expertise and broken in with the heat cycle method, never abused and never overheated, only run on Byrons 30% Race 3000 fuel, adult owned and operated . Pushed a Mugen MBX5T around like a ragdoll, very fast top end with TONS of torque, it'll include a 3 shoe aluminum clutch with 14t bell. $100 shipped!