POLINI Vespa Road Exhaust GT-GTR, SPRINT VELOCEPOLINI Vespa Road Exhaust GT GTR, SPRINT VELOCE Box style exhaust systems offer a subtle aesthetic and balanced running performance for city traveling and long distance driving. They are budget friendly and much less expensive than expansion chamber systems. This convenience has led to a sharp increase in their popularity among geared scooter owners. To fit the following models GT GTR 150 SPRINT SPRINT VELOCE Comparison No. 200. 2020 (POLINI)