I really look forward to try one. An OS 5,5 are just great on a Nova with a significant powerloss. The tuning window are narrow but I really likes it, because you "easily" can hear, when the tuning has changed e.g. during a race day.

Many Danish drivers runs 7 mm in their RB and SH engines and gets +9 min of runtime - the same as I do with my Nova Plus 4 Team with 5,5 mm venturi.

I'm gonna try try both 4,7 and 7 mm venturies to see the difference