I had an Avistar with the 46 FX and a Macs Pre-Tuned Pipe on it. It would scream. I never clocked it with a gun, but an experienced flyer at the field said it was probably doing 70-80 MPH. I guess I was the proud owner of the worlds fastest trainer. This was the RTF version, I just swapped out the engine. I still have the Avistar, with a 46 SF in it, and a tower hobbies muffler. It does pretty good with this combo, but it isn't the same as the 46 FX with the tuned pipe. It was a blast to fly. I agree, it does way more than most trainers.