Kab I ran them on my 21DCB/Daytona with twin stock 260s. I had the ROS chips spinning 8200RPM. The four blades left hard and gave alot of tramsom lift that my old 21 needed, more than your mach. The ETs I have left harded, but then again their 26s. Handling and mid range was very close. I would love to sell you my 28s but to tell it to you straight I think the ETs are better. But come on my 28 are cheap. I think you should try my 26s at the BBSP for the hell of it.