If u r new to buggy and for inside running the O.S. VG does just fine. Will get left behind a lil on the long straight tho. The entent depends on tuned pipe choice. If you cant use a $300 race engine to its potential, better to leave the $$$ in ur pocket and ur buggy on its wheels.

Never had the Nova so I can't comment on that one.

Probably cant go wrong with either one.