Engine air intake systems for land vehicles comprising intake manifolds, air filters and air filter housings, super- or turbochargers, throttle valves and linkages, charge air coolers; engine exhaust systems for land vehicles comprising exhaust manifolds, exhaust headers, exhaust mufflers; engine valve systems for land vehicles comprising cylinder heads, camshafts, engine valves, valve springs, rocker arms, valve trains; and fuel systems for land vehicles comprising fuel tanks, fuel lines, fuel pumps, fuel filters and separators, fuel injectors and injector nozzles or carburetors, electronic engine and/or fuel control and/or tuning management controllers, throttle bodies, fuel rails