The German tuner has presented their complete customisation proposal for the 2011 BMW 5 Series so its all about appearance as performance upgrades are yet to be completed.
Besides a 35 millimeter lower suspension, the 2011 BMW 5 Series by HAMANN achieves a sportier look thanks to redesigned elements that include a new front spoiler and bumper that incorporate the daytime LEDs, new side sills, roof and rear spoilers plus the 4-pipe exhaust system with pipes measuring 90 mm in diameter that offer a deeper growl coming from the V8 on the 550i model.
The 2011 BMW 5 Series by HAMANN sits on 21 inch aluminium alloys while at the interior the tuner can apply their carbon kit to the dashboard, center console, door handle panels and steering wheel, and additional elements include aluminium pedals and foot rest and new floor mats. 
Hamann press release :
Aerodynamics, engine sound and carbon inside –
Exclusive HAMANN refining programme for the BMW 5 (F10)
For the new BMW 5 series F10, HAMANN Motorsport of Laupheim presents a sporty all-inclusive, no-worry package of aerodynamics components, alloy wheels, sports exhaust system and decorative interior fittings in carbon fibre.
To create a sports car with four doors from an ordinary limousine with sporty aspirations, a number of cosmetic modifications are necessary. HAMANN begins with a comprehensive pedicure by issuing new alloy wheels in various designs and sizes for the BMW 5 (F10). The most striking of these is the DESIGN EDITION RACE "ANODIZED" rim in 21-inch format. With its spider in matt black and brilliantly polished rim, the DESIGN EDITION RACE "ANODIZED" is supplied as a complete wheel set with 255/30 ZR21 front and 295/25 ZR21 rear tyre sizes to interested customers at a price of 8390 euro. The special aluminium alloys make the rim super-light but also capable of bearing a high load. The titanium wheel bolts are particularly corrosion-resistant and also save several grams of unsprung mass.
The design idiom of the new BMW 5 (F10) is now already thoroughly sporty, but there remains room for further improvements, which HAMANN makes accordingly. For the standard front apron HAMANN offers an adaptable front spoiler and bumper covers with built-in daytime running LEDs. The low-slung side skirts and the roof and rear spoilers change the unexciting look of a family limousine into one of a dynamic sports car. With its in house-designed middle panel of the rear spoiler HAMANN has made room for the tailpipe of the stainless steel exhaust.
To lower the centre of gravity of the BMW 5 (F10), HAMANN uses progressive suspension springs to obtain a drop of about 35 millimetres, which reinforces the powerful look of the complete package.
Especially for the 550i, HAMANN offers a muffler with 4 tailpipes. These have a diameter of 90 millimetres each and allow the V8 engine of the top 5 model to sound in accord with its status. A metal sports catalytic converter including middle silencer can be ordered on request.
So that the interior does not have to hide behind the sporty exterior looks, HAMANN can equip the dashboard, central console, door handle panels and steering wheel with a carbon interior set with sight carbon in dull titanium grey. Other colours for these carbon fibre parts are also available on request. The driver’s feet can feel good on aluminium pedals and an aluminium footrest. In addition the footwells benefit from HAMANN floor mats.

Source: Hamann