I had a couple of those megatech .21's 3 ports. It is an SH based .21 and they always tuned fine and ran fine.. just didn't have much power at all though. Probably a 1.5hp engine. ITs got a lot of stuff on it but its all the cheapest stuff money could buy on it and I think that is abd old Robins .21 converion or something like that it raises the engie wayyyy up to make clearance for the engine. Super high CG and lots of problems with flex and the header melting the rear shock tower and the header getting dented and torn up in a crash when the shock tower hammers into the header. I'm sure its pretty fast though and the enigne wont' have soo much power it will break weird driveline parts but I don't know. it looks kinda rough and the rainbow color scheme... ehhh... but for an even trade for an e-maxx mmmmm.. mabey because there isn't much of a market for e-maxx's.