Hi,
I have built a Mid Super Stinker recently. I have not the engine for it yet, but almost everybody will tell you that the best engine is the Moki 180.
I bought a Brisson 2,4 (still waiting..) and will not use the inverted pitts muffler, but side muffler to save some weigh. Another member of our club has it with a Laser 200 V twin, but it is not enough power, definitely needs more. I would be glad to let you know later about how it turns out, just drop me a mail in about two months.
The plane builts nice, but you may need a fiber cowl from Stans Fiber. They are nice.