Thanks for the replies everyone. I ordered everything from Central today. Now I just need to cover up the original 2C tuned pipe exit hole in the bottom of the fuselage and cut a new exit for the Hatori. I was about to start painting my new Integral this weekend, but might wait unless I can figure out where to locate the new hole. If I knew how far back from the spinner backplate to locate the exit, I could make the mods right now "blind". Does anyone have that exhaust hole dimension handy when using the 822 header and 821 muffler?