The Street 2T Giannelli is a line of exhaust and silencers for motorcycle Derbi GPR 50 2T (2010>) born to improve performance on 2 strokes street bikes, exhausts are made with a muffler and a silencer. Muffler is made with several sections, manually coupled, welded and checked to ensure a good torque increase from lower rpm. Muffler is treated with transparent paint, to protect and enlight these features. Depending on model, silencer is available in kevlar, carbon fibre or aluminium.