A pipe?? Remind me to bring earplugs
I have a .46 FX on mine with a dry weight of 5 LBS. To put it bluntly, it's not enough. The pipe may mitigate that a bit. I'm planning on swapping ou the OS muffler for a mousse can. If that doesn't work, I'll but a Magnum .52. Good engines I hear.
If you want it to hover, that 46 will do nicely. If you want to win vertical drag races, buy a new engine.