So I spoke with Eddie, and will probably go with the trx5, he mentioned I didn't need the big bore pipe. I have recently picked up some RPM front hubs, and a 40.5mm TMX carb, gotta clean those up a bit. Waiting for a little more warmth in the garage, I haven't yet set up my wood burner for it yet. Just need to build a heat exchanger...and I just bought a new project...