Alpina Roadster S is sports car modification that was developed on the first generation of BMW Z4. The model had a hardtop and convertible top options. Both options of Roadster S shared the same 3.4 R6 300 hp (221 kW) gasoline engine and six-speed manual gearbox but the softtop version could achieve higher by 5 kilometers max speed. Vehicle was produced from 2003 to 2005.