Since Gull bhai have already ordered one silencer, i was thinking about its impact on Performance.
The size of exhaust pipe may have some positive or negative impact on the performance on engine.
I obviously don't know much in this regard, but i'd really like some knowledgeable person to shed some light on it.
Classic & Deluxe have some minor difference in their exhaust (Deluxe Exhuast seems slightly bigger and longer, but i may be mistaken) so obviously there will be a difference in Piaggio and Deluxe's exhuast as well.