Fitting an Ivans kit, any advice re do's and don'ts?

[PieEater]

... thoughts on whether I need to put a more free flowing exhaust on would be appreciated....

When I had my bike Dyno'd after having had the full monty done I got them to do runs with the baffle in and with it out. With the baffle out it produced 7hp more and the fuelling was also better, I can definitely feel the difference when riding. The full monty kit is designed for a free flowing exhaust so to get the most out of it you would need to replace your can if it is restrictive. If you don't want to mod the airbox and intake rubbers as well as replace your end can maybe you can swap out your full monty kit with the slip-on kit !?!