The Renault R23 was a Formula One car which Renault competed in the 2003 Formula One season. It was driven by Jarno Trulli and Fernando Alonso. In the British Grand Prix, Renault upgraded their R23 to a B-spec version. The revised aero-package included lower sidepods and a new diffuser, gaining around 3 tenths of a second per lap. A smaller and lower side pod enabled more air to flow onto the rear wing, while the new exhaust layout allowed the engine to produce the so much needed extra power. These were redesigned to push out the exhaust gases to the back of the car, instead of pointing upwards as was the case with the Renault R23.