The layout of the exhaust manifolds is 2 into 1 into 2 with twin tailpipe under the sump. The design of the exhaust assembly is a work of highly refined engineering: the ends have a complex exterior shape due to the size restrictions necessitated by the "deep sump" of the engine (on the interior) and the leaning angle (on the exterior). The primary manifolds have a Ø 55 mm diameter, the central manifolds a Ø 57mm; they are built in stainless steel and have a thickness of 0.8 mm, with only the two short exits from the cylinder heads having a larger thickness (1.0 mm) to better resist vibrations. Even the silencers are in stainless steel with exception of the outer sleeve (or outer jackets) in aluminium alloy with a 2 mm thickness (result of a process of pre-deep drawing, rolling and longitudinal welding). The reflection silencers have three chambers; in this application the chamber layout is especially complex with respect to the traditional design (used for the 1198) because the exhaust gas enters from the rear (with respect to the direction of travel) inside the silencer and exits again from the outside rear. From a construction perspective, this also implied a complex design, and at several stations of deep-drawing of the aesthetic rear endcap, the catalytic converters are positioned at the inlet of the silencers and have dimensions of Ø 80mm x 74.5 mm
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