I fitted a Weston UK Aerobatic Mini pipe to my DLE 20 today. Only ran it up on the ground then I had to head of too work.
Flying it tomorrow. Sound is definately muffled and theres an extra 450rpm on the tacho compared to the std muffler with engine turning a JXF16x8. Fuel is probably getting old too. Will tach it again on the next batch.

reliability... well we'll see tomorrow