Hamann released the Volcano package for McLaren Mercedes SLR about nine months ago, and although it faced some serious criticism regarding its boy-racer looks they thought it’s a good idea to bring it up again, this time in a red theme specially designed for the 2009 IAA. Apart from the design, it is an engineering marvel and it’s even faster than the original SLR 722 by 11 km/h!
The source of power in the Volcano Red is a modified version of SLR’s supercharged V8 engine. With some modifications including a newly programmed control unit, especially developed high performance exhaust manifolds and an amended belt pulley combination for the serial compressors, it now checks out 700 hp and torque of 830 Nm!
The result of this much power is definitely blistering performance: 0 to 100 km/h in 3.6 seconds and maximum speed of 348 km/h.
Hamann also had to re-program the computer which controls gear changes to make it compatible with the new engine setup, and also installed a new water pomp. The Volcano, even if you don’t look at it, is distinguishable from normal SLRs because of it’s crazy sound! It comes with six mufflers on each side of the car rather than the regular four.
The SLR Volcano Red is fitted with Hamann Edition Race 21 inch wheels with 255/30ZR21 tires at the front and 345/25ZR21 at the back.

Source: motorward.com