i guess you've read this 1st?http://www.cartestsoftware.com/fz1/jetkitinstallation.html
... thoughts on whether I need to put a more free flowing exhaust on would be appreciated....
Pulling and refitting the carbs takes about 15 minutes each way ... if you've done it a few times. So, in practical terms it's actually pretty easy. I realize that in real world terms, for someone doing it for the first time it takes a lot longer and you need to take your time to figure out the best tool to use, how to approach it and how much effort to apply to things like sliding the carbs out. The reason the instructions out there on the web are a little daunting is because they are so comprehensive. Don't let that put you off. I would see how it feels and runs with the Leo Vince can and - if necessary - keep your eyes open on ebay for a nice used can with a removable baffle, if you decide you want to try something less restrictive.
As someone in the same boat wanting to do this, if anything Mike's post has put me off hahaI am bound to fuck something up!!I'll just keep telling myself it feels fine I think lol