George,

My 15 LA will be run without the muffler, as we don't require them at our field. Haven't decided on a tank yet, but probably a uniflow wedge like the McCoy 35 RH on my Skyray.

Being old school, I've never run uniflow before, but I'm very impressed with the engine runs.

It's a pity OS dropped the control line versions of the smaller engines. Had to buy a venturi and needle from Tower to convert my otherwise inexpensive OS 15. Also installed an FP aluminum backplate.

Bill