It is original delivered as a BRABUS from Mercedes with some Carlsson optimazations. BRABUS engine M104.980 3.6-24 with 285Hp and 362Nm. on standart exhaust. Carlsson upgraded the Catalyst with a Sport Metal Dual Catalyst system and with the brabus muffler, this raises the engine output to 300 Hp and most important 402 Nm. Top speed with 5 speed automatic transmition is 272 Km/h. and 0-100 is reach in 5.9 Sec. This video is from 2006 I have had the engine upgraded futher since that in 2010.