I did a search with my limited computer skills and looked for a thread on what size pipes will fit without interference,I know I know another exhaust thread.
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To my knowledge, twin cam head-pipes will fit all twin cam trikes, and the same going for the m8’s, the exception is there are no 2:1 currently on the market. Mufflers, pre m8 mufflers fit all current trikes. The intermediate pipe, V&H makes one, but I have no idea if it increases performance. Keep an eye on muffler lengths/end caps, hope this helps.