RE: Evolution 58 NOT THE same as MVVS58??
Ok well I'm on 300 feet elevation. Test the Evolution 58 on MTW 75TDK canister and header, so its not a muffler issue. The engine got 5625 tops.
A Guy in New Orleans before Katrina had a MVVS 58, JMB 80 muffler, 24x10 6855 RPM TNC tach! DA-50 modified Pitts: 6780 RPM
AndyT, what muffler are you using, bisson side mount inverted muffler or the wrap-aroud inverted pitts style muffler?