BGM claims its Pro Big Box Clubman Sport exhaust delivers the most power of all its Big Box systems when fitted to a Lambretta Series 1, 2 or 3 with a standard exhaust flange. It is based on the BigBox V4, with the power increase (that gives it the ‘Sport’ moniker) achieved by redesigning the internal silencer chamber, which required a hidden muffler, placed underneath the engine and almost completely hidden from view. SRP is £299.99.
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