In addition to an engine now boosted to 230 hp, it is above all the presence of a limited-slip differential - a very rare feature at a time when most manufacturers prefer to rely on electronics - that convinces enthusiasts. Enthusiasts will also notice that a "Cup" chassis comes as standard, synonymous with even greater efficiency, to the detriment of ride comfort, even if this remains acceptable on a daily basis. However, this is not the case with the ultimate evolution of the R.S.: unveiled in July 2008, the R26.R unashamedly asserts its status as an accomplished tracker. While the engine remains identical to that of the "basic" R26, the car is 123 kilos lighter than its predecessor. This impressive weight saving is apparent both from the outside (the hood is made of carbon) and on board the car, which has lost its rear bench seat and most of its comfort equipment. The front seats, meanwhile, have been replaced by Sabelt bucket seats fitted with harnesses, which will delight purists but are obviously impractical for everyday use, and not recommended for sensitive backs given the extreme stiffness of the suspension. A car to be driven more than driven, the R26.R - timed at 8 minutes 17 seconds on the North loop - is without doubt the most captivating and exclusive of all Mégane R.S. cars.