The BMW E30 adjustable spoiler is an extremely lightweight / high quality rear aerodynamic wing with an adjustable gurney flap. This allows you to tailor the amount of rear end downforce / drag depending on the circuit requirements and are the same rear wings that are used extensively in the Kumho BMW Championship.
Available with a Glass Fibre or Carbon Fibre Gurney flap and for the E30 and E30 M3.