Re: Pipe City
I would heartily recommend doing biz with Pipe City. I got my M4 from them and they have a very nice selection of pipes, friendly and helpful customer service, and competitive pricing (which includes shipping, btw). My good buddy from Elyria (FZ pilot who made the Hoot trip with me) bought his TRS from them and has nothing but good to say.
They recently joined forces with Helmet Harbor. Both excellent companies.
Edit: If you're after a pipe for your bike, one that's not listed for your machine, call them up. They'll likely be able to get it for you.