Jaguar xj8 performance chips will always give your car an excellent upgrade with much benefit. Adding these performance chips is one of the easiest and the most effective in that it will only cost you less and save much of your time when installing for you only need a few hand tools and a couple of minutes. Immediately after installing the horse power will instantly increase thus making acceleration faster. The fuel mileage is also improved which leads to reduction on the rate of consumption and a higher output when on the toque part of it. You will experience total difference when stepping on the gas pedal for you will be required to use less energy. A new Jaguar XJ8 ECU chips begin working immediately after installation recalculating necessary ratios when it comes to performance, it also does no harm on your engine. These chips are provided with their relevant information and instructions to be followed when installing, better still a guaranteed warranty is also provided along.