Ferrari 458 - Valved ExhaustValve controlled exhaust system for the Ferrari 458. The rear muffler is designed for accurate fitting to the original connections and is completely made from stainless steel grade 1. 4828. This kit is proven that it adds up 40 Hp and up to 65 Ft Lbs of torque as a complete system so we recommend purchasing the Manifolds along with the Catalytic Converters and the Exhaust system to get the most out of your Ferarri 458 The iconic CAPRISTO Valved