BGM PRO Big Box Touring V2 Exhaust Vespa PX125, PX150, Sprint, GT, GTRBGM PRO Big Box Touring V2 Exhaust PX125, PX150, Sprint, GT, GTR The BGM Big Box is a great exhaust! We have fitted several to tuned and standard engines. We have found that the exhaust works significantly better than other standard aftermarket Exhausts. Revised version of the popular touring exhaust system from BGM. Called BBT for short, the system now features a new manifold as well as flatter exhaust tips. The significant increase in torque and