RS Tuning is one of Germany's most highly regarded specialists in the upgrading of Porsche turbo engines - and this expertise is now available in the UK through G-Force Motorsport for a range of models, including the Boxster and 996.

Using as many Porsche parts as possible, upgrade kits can take a road car to 448 bhp, and a road/race car up to 562 bhp. In fact, the twin-turbo 911 featured here will not only blast to 124 mph in a little over 10 seconds, but also reach a top speed of 218 mph!

Modifications have also be developed for suspension, transmission and braking systems.