GPR exhaust compatible with Piaggio Vespa 300 Gts - Gtv - Touring - Super 2019-2020, Evo4 Road, Homologated legal full system exhaust, including removable db killer and catalyst GPR supplies a 304 stainless steel manifold including and homologated catalyst. The package includes flanges, bushings, brackets. It mounts directly on the cylinders without any structural changes.GPR products are plug-and-play. However, GPR recommends the installation from a licensed mechanic as GPR will not accept any claims from a do-it-yourself installation.Made in Italy with a 2-year international warranty.Environmental certification ISO 14021 zero impact