DFalpha, I have the Katana S and was going to try to put a Macs pipe on the OS 46 that's on it. Well, the Macs is a couple of oz. lighter so it makes it too light in the front end to work out. The only thing I could think of to make it work is to locate the tail servos into the front end and end up with more of the weight up front. The way my Katana is set up now with the OS 46 and stock pipe, it's still a killer plane to fly. Lots of fun. Anyway, good luck.