I should have stayed away - There is obviously an audience for engines - which are simple, piston port unmuffled types -
another audience for small but more powerful engines and noise reduction. Each has their own idea of performance and value The fuel used is yet another audience .
The most power and smoothest running setup I have yet seen in this size --is a ST2300 I did -on a tuned can and using spark ignition and 5% nitro and alky fuel
loafing it pulled the 18x8 APC's at 9000 on the ground.
But it certainly was not for the buy n fly audience---