exhaust pipe mod

Does anyone have any experience with cutting off the catalytic converter/muffler (not sure it's exact name..), welding on additional exhaust tubing and then using a slip-on? Can do this please advise any hazards/pitfalls to lookout for.

Hi everyone, I'm completing the MSF course this weekend and have decided on a FZ6R as a first bike (first post too). As such, I have been pouring hours upon hours of research into the bike - sometimes I forget where I saw/read certain things. Anyway, I could have sworn that, as unrealistic...