The BMW Z4 3.0si was a sportier version of the already very dynamic BMW Z4 3.0i. At the beginning of 2006, it was presented for the first time with the model revision of the Z4 Series. In the European markets, it completely replaced the BMW Z4 3.0i, while both versions were supplied in parallel in America. As a result of a new six-cylinder engine (N52B30) with VALVETRONIC and Double VANOS, the new flagship model boasted 265 hp with extremely low fuel consumption and emissions.