Add Wish List Quick view Choose Options RaceChip XLR5 - Mercedes-Benz R-Class (W/V251) (from 2005) R 500 (306 HP/ 225 kW) Next-gen throttle response for your MB R-Class (W/V251) R 500 The RaceChip XLR5 is our latest throttle response controller with advanced calibration and ultra-precise response curves. The most... RRP: Was: Now: £199.00 - £249.00 Choose Options Compare