Hand-made sports exhaust system from the Portuguese manufacturer Tecno. Equipped with a genuine Aramid end can and thick walls. It has a genuine carbon fibre silencer with much better build quality. The Evolution runs best on 50cc and 70cc sport cylinders. Comes with E-certification. The silencer is "Racing" designed with a plug and socket connection and is very "crack resistant" All round very good sport exhaust system with good performance and at a reasonable price.