I ran my engine with a Jtec dual snuffler and two Hobbico exhaust deflectors.

The deflectors reduced my rpm by 200 but reduced my clean up at the end of the day to 1/2 sheet of paper towel. That's after flying a gallon thru it.

I ran APC 18X6: 9400 rpm, APC18X8: 8400 rpm, Bolly 18X10 7800 rpm, Bolly three blade 16.5X10: 7800 rpm, Mejzlik 20X6: 7800 rpm and Mejzlik 20X8: 6800 rpm and sagging.

The 20X8 was just too much.

The best thrust was between the 20X6 and the 18X6. The 18X6 was LOUD!

Brian