Few words about ciao I have tried some ciao perfs exhausts , the simonini serpentin ,the polini sp ,top one ,so far my choice is for the top one polini ( don't buy cheap it's not worth it)
Why?Noise performance and built quality ...simos are loud mfuckers and they'll get louder if you have a stronger engine (something that sellers don't really tell you when they cash your money) making you a perfect target for noise complain by cops and the old fart next door,
My Italian beauty sports a carb 13/13 (71 jet) a polini 63cc, and the top one polini exhaust I blew the speedo at over 40miles ph.after that a ciao become perhaps a bit too airborne.
you can make those transfomations in one afternoon !!
Ciaos are too sexy !check treats on ebay and zippymopedparts.com