Over the past few months, we here at ECU Tuning Group, have paid more attention particularly to the 5.0L supercharged Jaguars than any other vehicle. Through the months of testing and data logging, we noticed that there are absolutely no internal differences, other than exhaust (XKR-S), between the 470hp, 510hp, and 550hp Jaguars. As stated on our previous blog (Jaguar XKR-S ECU Tuning), Jaguar placed limiters within the software that affect each model differently. By pinpointing the location of these exact limiters, removing them and giving the vehicle a further tune, we are now able to transform any 470/510hp Jaguar into a xkr-s…and then some solely with an ECU tune. This a great opportunity for customers who need the convenience of a four door car but want the added performance of the XKR-S.   Gains achieved:                 Factory                    ECU Tune                        ECU Tune w/ Pulley 470hp                          565hp+                                   590hp+ 510hp                           565hp+                                  590hp+ 550hp                          575hp+                                    605hp+   Beneficial features of reprogramming the ECU: removal of speed limiter, increased exhaust note, flatspots/hesitation removed for better driveability. For owners who are not accessible to any of our dealers, you are in luck. We are offering a new package where you will be able to reprogram your vehicle through the OBD II port in the comfort of your own home. The process is simple, safe, and easy. Contact us directly for more information.  Please view the price list for the updated pricing. For customers wishing to see similar results of a tuned XKR-S, we recommend purchasing a Quicksilver exhaust. For those unfamiliar with this company, they work hand in hand with the Jaguar and Aston Martin British Race Team.