Polini 177 kit for px125, year 2000 model

I have a totally standard PX125, year 2000 model and would like to upgrade it to get a bit more performance out of it. I have been told to get a Polini 177 kit and a Sito Plus exhaust by a fellow scooterist.
In the SIP catalogue it says the Kit should be used with Sito Plus exhaust and 24er SI Carburetor. What kit do I need to fit when putting on a Polini 177 kit? Also, is there any exhaust out there that is slightly better than the Sito Plus, but around 100 euros? Anyones advice would be greatly appreciated.
Thanks[:dance1:]
Forgot to add that i am a total novice and would like to know if there is much maintenance involved if the kit is fitted. The scooter is used to daily to commute to work and back - about 25 miles a day.
[:dance1:]

[ Message edited by smcelney on 27.04.2002 ]

thanks for your reply. Should I put a new Carb on? If so which one?![:)]