To optimize efficiency, the Ferrari 458 Italia has been designed to satisfy the dual objective of providing the driver with the most complete feedback typical from a Ferrari V8 engine whilst also guaranteeing high levels of acoustic comfort. The silencers are equipped with by-pass valves that are activated at maximum performance. At lower revs, or on a partial throttle, the exhaust gases exit from a second pair of smaller diameter tubes. The result is a Ferrari 458 Italia's engine sound not invasive at low revs but fuller and richer at increasing performance. Under low performance, the by-pass valves close, trapping the exhaust gases in the two silencers. At high performance and in particular under hard acceleration, the ECU responds by opening the valves and feeding all of the exhaust gases directly to the two outer tailpipes. The catalytic converter is attached to the central section of the exhaust by a flexible element which allows reducing the amount of vibrations transmitted to lighten the overall system. Similarly, the pre-catalytic converter has been eliminated, lowering overall weight and reducing back pressure whilst still complying with strict Euro 5 and LEV2 emissions legislation. Despite the more powerful engine of the 458 Italia compared to the one from the F430, the new Ferrari produces just 307 g/km of CO2 whether fuel consumption is 13.3 l/100 Km (combined cycle), reaching the best value in the entire segment.
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