Blackie,

Nice tip on the muffler. I've gotten suggestions in another post of mine that a flex pipe is needed because of vibration. That this vibration will lead to fatigue since there's no stress relief like a flex pipe will give. I don't buy into that personally since every flex pipe I've ever had has cracked.

Let us know how the ST-M flies with your configuration. Mine is still a few weeks away. I have to add flying wires and detail out the cockpits, add the pilots, etc. still. I have the stock 14oz tank in mine. From other posts I've made it seems that 14oz will give me plenty of flying time so you 16oz tank should be OK.

Jeff