Mine had a Jets Munt 100 to begin with and it flew just fine but it was felt a little more power, say on a windy day wouldn't hurt.
To that end a Jets Munt 140 is now fitted (only other turbine I had spare) It is a small light turbine at only 102mm dia and 1400g.
I now use the same if not less fuel and have plenty of reserve power and it cruises around at about half throttle.
A small can 120n turbine would be ideal if you have one if I were to buy a turbine specifically for the JL (BVM) Cougar that would be my choice.