I am flying a Showtime with a EVO 26 and full pipe.
Tho this is not an ABBRA - this combo of a gasser and a pattern design (look at the Showtime before you scoff) is excellent.
power is truly VTO-on Skoerpa 17x8 prop -(looks like a wooden Mejzlic)
very quiet - extremely smooth one flip starts and 10 ounces of fuel plenty for full flight.
I also ran a ZDZ40 and pipe - more power -on bigger plane and also more viberation -which we now solved by a carb swap to a Walbro model 201-which has much different metering
Also did a ROTO 25 on Skoerpa pipe and 17" prop again extremely smooth running etc..
Why more people have not caught on to these combos is really a puzzle.
I am not new to the "needs of a pattern design" - these setups really work.