I would say more like 15K more usable powerband as opposed to a 6 mm insert
I tested this engine on a 6 mm, 7 mm and 8 mm...... the 6 mm is choked.... the 7 mm was better but the top end still choked..and the 8 mm runs like a banshee but has a weird anomaly off the bottom end I cannot tune out.... like a dip in power after clutch engagement before the engine takes off and pulls a big top end...The Mizer seems to have the same bottom end as the smaller inserts but has nearly the peak power and RPM of a 8 mm insert...Crazy thing is the Mizer is known to get as good or better mileage then the standard 6 mm.. Much much better then I expected...unreal considering the engine is barely past half throttle.. Now the down side is the tuning window on the Mizer is narrower, the bottom end need to be richer and the top leaner then a standard insert.........