I talked with CEN today and they are working on an adapter for other make enignes like the OS 18CVR with slide carb and short crank.

He also said they had opened up a normal 5 cell RX back and reconfigured it to fit in the stock box. I am going to try this weekend also.

I have been doing some measuring and i think a stock .15 nitro stampede exhaust system will work. I am watching one on ebay to win. Keep you postedon what i find.