No, it's got nothing to do with single or dual. Engine doesn't know how exhausts look, important is what it does, FLOW, everything is pretty much explained in this thread, take your time and read it all ( except Arntufun's posts, lol) .
My suggestion:
Go for HMF , not that there is anything wrong with TB, they just became so boring since you see them on most Spyders, even HINDLE looks special nowadays . You'll be good with O2 mod here - it does the job.
If you decide to go with TB, there is JuiceBox on eBay for some $150,- used, hurry up and get it.
....don't forget to came back after your upgrade and give us feedback.
Ryde Safe Bro:thumbup: