The one on the RF-P is a Hatori header. The one on the Hanno is a Mac's header. I have good and bad luck with the Mac's rear exhaust headers. I have had a couple crack where the pipe meets the flange due to using a soft mount or a very slight out of balance prop (vibration). I have fixed them with Alumaloy welding rods and never had a problem again. The Hatori header is more stout indeed..... but the weight is double of the Mac's header.