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FYI, the Stirling Moss roadster has to be a great long term investment:

Variants
722 Edition

The Mercedes-Benz 722 Edition features some upgraded styling.
SLR McLaren 722 Roadster Variant.A new version was introduced in 2006 called the Mercedes-Benz SLR McLaren 722 Edition. The "722" refers to the victory by Stirling Moss and his co-driver Denis Jenkinson in a Mercedes-Benz 300 SLR with the starting number 722 (indicating a start time of 7:22 a.m.) at the Mille Miglia in 1955.

The "722 Edition" includes an engine rated 650 PS (480 kW; 640 hp)@6500rpm and 820 N·m (600 lb·ft)@4000rpm, with top speed of 338 km/h (210 mph) (3 km/h (1.9 mph)[citation needed] faster than the standard SLR). 19-inch light-alloy wheels were used to reduce unsprung weight, while modifications were also made to the suspension, with a stiffer damper setup and 10 mm (0.39 in) lower ride height introduced for improved handling. Larger 390 mm (15 in) diameter front brakes and a revised front air dam and rear diffuser were fitted.

Exterior changes, other than the larger 19-inch (480 mm) black light-alloy wheels, include red "722" badging, harking back to the original 722 racer, and slightly different taillights and headlamps.

The SLR 722 can go from 0 to 100 km/h (62 mph) in 3.6 seconds, 200 km/h (120 mph) in 10.2 seconds and 300 km/h (190 mph) in 29.6 seconds and can reach a top speed of 338 km/h (210 mph).

Roadster

2008 Mercedes-Benz SLR McLaren roadsterA roadster version of the SLR went on sale in September 2007 for £350,000 ($534 485 U.S.). It uses the same supercharged V8 AMG power plant as its coupé siblings, developing 626 PS (460 kW; 617 hp), to propel it to a top speed of 332 km/h (206 mph) and enable 0-100 km/h (62 mph) acceleration time of 3.8 seconds.

However, as a convertible the roadster was burdened with extra weight and this affected performance and handling. The Roadster's roof is made from a "newly developed material" and does not take the form of a folding metal arrangement, as is now common on many modern cars. Following a manual unlatching, it takes a mere ten seconds to fold away electrically. According to an official document from Mercedes, the cabin of the roadster is capable of allowing conversation between driver and passenger up to a speed of 200 km/h (120 mph) with the roof retracted. This roadster is aimed to compete against other sports cars such as the Pagani Zonda F Roadster.[9]

[edit] Roadster 722 S (2009)
A limited edition (150 units) of the 722 coupe. It can reach 100 km/h (62 mph) from standstill in 3.7 seconds and has top speed of 335 km/h (208 mph).

The model went on sale on 2009-01-01.[10]

722 GT (2007-)

One of 21 SLR 722 GTs at the Goodwood Festival of Speed.The 722 GT is a tuned version of the SLR 722 which is developed for a one-make racing series. The cars are built by Ray Mallock Ltd. with approval from Mercedes-Benz. The car features new wider bodywork to accommodate 19 in (482.6 mm) OZ racing wheels. The front grill vents are removed and larger, free flowing air extractors sit on the hood and flank the side of the car. The rear now has a racing wing and diffuser.

Under the body, the car has shed 398 kg (880 lb) and reduced its dry weight to 1,300 kg (2,900 lb) . The engine remains in relatively stock specification but now produces 680 PS (500 kW; 670 hp) and 830 N·m (610 lb·ft) at 1.75 bar (175 kPa) boost. Inside, the car is stripped out with only the essential functions being controlled from a carbon fiber binnacle. New carbon fiber door panels and full roll cage complete the transformation.

Renntech announced 21 SLR McLaren 722 GT would be available to the North American market exclusively through RENNtech, for €795,000 (1.2 million USD).

Stirling Moss (2009)
The SLR Stirling Moss is a limited edition (75 vehicles) of the series, which uses a speedster styling that does not include roof or windscreen. The design is inspired by the 300 SLR race car by a young Korean designer Yoon Il-hun, who is working in headquarter of Mercedes-Benz Germany . It is the last series of the McLaren SLR built under the partnership between Mercedes-Benz and McLaren.

The supercharged V8 engine is rated 650 PS (480 kW; 640 hp). The car's top speed is 350 km/h (220 mph) with acceleration from 0–100 km/h under 3.5 seconds. The car is approximately 200 kg (440 lb) lighter than the regular model.

The SLR Stirling Moss began production in June 2009, after SLR Roadster's production ended in May 2009. All 75 cars will be produced by December 2009 . The SLR Stirling Moss has MSRP of €750,000 and will be available only to current SLR owners.

The vehicle was unveiled in 2009.
 
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