S.I.P NG silencer change...

Hi guys,

Just a quick question, I am currntly running the SIP NG exhaust with the aluminium sdilencer (32mm outlet)... I have ordered the Carbon silencer (25mm outlet)... Will I need to change my jetting?

(running on a Malossi 221, reed valve with 30mm BGM carb).

Cheers in advance....