For people who think a normal Porsche Turbo S is not fast enough, there are various companies to optimize their cars. One of the most famous is RUF Automobile GmbH in Pfaffenhausen, Germany. RUF was founded in 1983 by ‘Alois Ruf’ as a manufacturer and tuner specialized in Porsche vehicles. Despite to other companies RUF is not a 'Tuner’ but a manufacturer, which means they develop and produce their own creations based on Porsche cars. Such as the famous 'Singer’ vehicles or others.
One of their fastest creation during the last years based on a 911, has been the famous RT12. Now, with Porsche introducing the 991 they developed another beast. It is called the RTR!