dbr derbi superfast low 50ccThe DBR Derbi Superfast Bassa 50cc expansion represents a solution for tuning Derbi engines. Made from Ferro P04 with handcrafted workmanship, this exhaust is designed to handle very high gas volumes and non standard rotation speeds. The Superfast Bassa (low mount) design, combined with hand peened welding, allows for a perfectly smooth internal passage, eliminating turbulence and maximizing gas velocity. This results in an extremely aggressive push