Vespa PX125 PX150 Sprint GT GTR BGM Pro BigBox SPORT Exhaust BFC20 One of the main factors

One of the main factors affecting volumetric efficiency is loss due to friction that the fluid encounters (air-fuel mix) when feeding from the air filter to the combustion chamber

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Vespa PX125 PX150 Sprint GT GTR BGM Pro BigBox SPORT Exhaust BFC20 One of the main factorsThis product is now discontinued, and has been superceded by the V2 version click here Vespa PX125 PX150 Sprint GT GTR BGM Pro BigBox SPORT Exhaust The BGM BigBox Sport a wolf in sheep's clothing Performance like a racing exhaust design and sound like a standard exhaust. The BGM BigBox Sport is a purebred Vespa racing exhaust with the unsuspicious design of a genuine exhaust. Like the genuine Vespa exhaust, the BigBox is also double walled and