In order to save weight, the M4's engine brace, trunk lid, and roof are all comprised of carbon fiber reinforced plastic (CFRP). The CFRP driveshaft, a one-piece component that provides great strength while lowering spinning mass for a tighter drive with less counteractive momentum, is the true masterpiece for both. The real crown of this cornering monarch is its rear-axle subframe with solid mounts, fastened to the body without the use of bushings to ensure the tightest handling possible, and its control arms made of aluminum, which drop weight even where it isn't visible.
Two TwinPower turbos are used in this car's high-pressure, quick-response turbocharging system to produce a broad plateu, and BMW's double-VANOS technology adjusts camshaft timing.
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