Everyone, thanks for the advice on the Jett motor. I think I will put the it away until I am ready for unlimited combat.
This engine does have the large venturi designed for a bladder the factory pipe which I was told is basically a tuned exhaust.
This should be fine for fast combat when I am ready.

I am going to order the ARF Flite Streak for the BB 25 Fox.

I also have a an OS FP-15 that is setting in a box. (Never run)
Would that engine be hard to convert to C/L? I tried to find a venturi, etc. but had no luck. (Just a thought.)