I installed the Dr. Pulley sliding weights (SR2822 28gm).
It definitely gives my xciting a more sporty feel. I can't tell if the sliding quality of the weights cause the better performance or simply the reduced weight (28 grams). The xciting revs differently and has a overall better acceleration and pickup speed. It does not effect top speed. Unfortunately it does effect fuelconsumption a little
I noticed that the roller weights need to broken in, but after that, they really come alive.
Look for ' scooter_wolfpack ' on Ebay. It cost me $ 58,- including S&H.
Next stop different windscreen and Malossi variator, belt and clutch. I may buy them on ebay Italy. Look for ' amr-1984 '. Seems trustworthy; their feedback seems okay and prices are lowest I could find.
Btw, I'm not in any way associated with Ebay, just passing on some info