Racing exhaust "Abarth" replica

Hi Everybody!

I'm about to buy a Racing Exhaust "Abarth" Replica for my PX125 2k (standard, un-kitted). I've heard that sounds and looks really really beautiful, but...how do you think it will perform?? Do I need to change jet/spark??

Can I increase performace with some carburator (or something else) in particular??

Please note that I'm a newbie in this questions! :D

Thank you in advance!

Cheeeeers