Vespa GS150 VS5

I have a few Vespa GS150s and am interested in finding out if anyone has bought and fitted the Abarth style twin pipe exhaust? If so,

1. Did it need modifyiing to fit the scooter in anyway.

2. Did the scooter need any modifications

3. Does it require a bigger main jet than the standard 103

Thank you

 

Mark