There are are a handful of older QM15 planes I know of flying with Jett .30,.35 power that I know of. Seems to work out rather well.
One in particular was a FIRE .35, and the owner installed a straight QM15 style exhaust extractor on it. I dont have a photo - must be loud as all get-out !! But I guess he was happy with it
Of note, the Jett BSE small block engines have the same footprint and mounting holes as an OS.32
Bob