RE: Proper Pipe and Header for Jett 60LX
I got back to you on that PM/email.....
Short answer here is ..
Use the jett-stream (gold) LX muffler that comes with it. Performance gain beyond that from a full-size pipe is minimal and just adds complexity, and you have to mount/support it.
As for a long pipe setup:
Headers are available from MACs (same as ST40 bolt spacing)
Pipes available from MACs. I think the 8.5cc pipes are what Dub provides for the FIRE 60LX engines.