The OPS and NovaRossi would choke on a long pipe set-up. The Jett would probably fine as it makes it's power at 17-18K. On my Skymaster 20 with the OS 25VF DF, I had to trim the header to it's horizontal minimum and take all of the front end off the pipe, just to get 20K on an 8x5. The standard VF is a better choice with it's lower RPM powerband. The MVVS and Jett are the only choices in my mind but what about the header? It would make the most sense to design it for *cough* electric power and SE Glow engines. Integrating an easily removable hatch to access batteries would be an added bonus. Personally I would prefer the Jett if you could get appropriate headers.