Excellent Polini "Top One" performance pipe for Vespa Piaggio Ciao, Bravo, Citta, and Kinetic mopeds. . The best performance exhaust we have for these models.
This will let you keep your pedals and original kickstand location.
Raw chamber/Black baffle
It will fit the Si if you really want it to, we have one on ours, no cuts on the exhaust, however we made a rear mounting hole and you may need to remove, cut or otherwise modify your front fender.