Welcome Quadzilla from Colorado! Beautiful steed you got there, I second what Steel says, I've heard only good things about Carpenter Racing's Street Rod exhaust and Jardine's. Let us know what you decide on!
I must have missed that bike by a day or so! I was in Ride Now on Saturday to see if they had anything of interest. Congrats on the purchase! Instead of a 10 minute ride home I'm looking at a 3 hour one!
Welcome.
Unfortunately, Jardines are no longer manufactured. Current choices include Carpenter racing, CES, Viking, Supertrapp, Zard etc. just do a search here.
I use Go Cruise 2 on my RIII Roadster and Throttlemeister on my RIII.