Lamborghini Miura built at the Lamborghini factory between 1983 and 1987 from an unused Miura S chassis. This was made for Jean Claude Mimran, one of the Mimran brothers, the then owner of Lamborghini. Most experts do not recognize this as an "official" SVJ due to it being converted (albeit done by the factory) long after the Miura went out of production. Further Miuras were subsequently upgraded to SVJ specifications (trying to imitate the real factory SVJs) by various garages of Switzerland, USA and Japan. Another one-off, the Miura Roadster (actually more of a targa-model, but without any removable roof) was built
V12 engine each piston can be smaller, lighter, and with a shorter stroke. Exhaust system tuning is also much more difficult on a crossplane V8 than a V12, so racing cars with V8 engines often use a complicated "bundle of snakes" exhaust system, or a flat-plane crankshaft which causes severe engine vibration and noise. This is not important in a race car if all-out performance is the only goal. Since cost and fuel economy are usually important even in luxury and racing cars, the V12 has been largely phased out in favor of engines with fewer cylinders. Engines are often designed around