Exhaust Note: Car Engine Sound

• Engines rebuilt to match real ones: a cutaway block, crankcase and cylinder heads let you watch the pistons, crank and valves work inside. • 4-valve heads (5 on the quad-turbo V12) with tappets or rocker arms, two-stage valve lift on the 2.0L inline-4, and each engine's own timing drive — guided chains, idler gears or a rubber belt. • Individual throttles, plenums, direct injection and dry sumps where the real engine uses them, plus true boxer and flat-plane V8 crank layouts.