I actually ran it with the MSR1005 pipe and header. This pipe makes very good mid-top but a little softer on the bottom. I'm going up to EB Mods perhaps next week to throw the JX-21 on the X-dyno to see how she runs with a few pipes. Ed has the 2050, 2060 and his EB Mods pipe. I have the MSR1005 and Novarossi 9853. I'm also going to test it with the Innovative Designs 6mm and 7mm carb inserts.