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  • Jaguar XJ 4.2 Remapping & Tuning

    Jaguar XJ 4.2 Tuning and Jaguar XJR 4.2 Remap Tuning

    Jaguar XJ Tuning and Jaguar XJR Remapping can be carried out by Paramount Performance at many locations across the UK and around the world.

    Our Jaguar XJ tuning and Jaguar XJR remapping is completely custom, with each XJ remap being written live to your vehicle, the Jaguar XJ tuning can take account of your XJ’s modifications, i.e. Paramount Jaguar XJ performance exhaust systems, or sports catalytic convertors as well as your driving requirements and fuel grade.

    Paramount operate the very latest range of car tuning and remap software and our dedicated team of car tuning engineers have years of experience working in the prestige and Ferrari car tuning arena.

    Jaguar XJ tuning and Jaguar XJR ECU remapping gives a power increases of around 25bhp (depending on precise model) with significantly better throttle response, full custom chip tuning and live rolling road testing and tuning for your Jaguar XJ are available at many locations – please ask for details.

    Paramount Performance is the home for all your Jaguar tuning and performance parts

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  • Jaguar XJ and XJR 4.0 200 catalytic Converters (Pair)


    Jaguar XJ Catalytic Converters (Pair) – High Performance Jaguar XJ 4.0 Catalytic Converters

    4.0 Jaguar XJ Catalytic Converters – High Performance 200 cell catalytic converters  

    The standard Jaguar xj and xjr catalytic converters have 600 cells per square inch, these original standard cats can be very restrictive in their gas flow.

    Paramount’s high flow  Jaguar  XJ Catalytic Converters have 200 cells per inch, these Jaguar XJ Catalytic Converters fit both  the Jaguar XJ and XJR. These Jaguar XK Catalytic Converters are integrated into a large bore downpipe, they reduce back pressure substantially and increase flow rates, they are particularly effective on Jaguar Supercharged engines. 

    Emission levels remain fully road and MOT legal. Performance Hi-flow Jaguar Catalytic Converters and Sports Cats work exceptionally well on re-mapped (chip tuned) engines. The power increase delivered by our Jaguar XJ Catalytic Converters is around 22-25 bhp across the midrange.

    Paramount Performance home for your Jaguar Catalytic Converters and all your Jaguar tuning needs  

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  • Jaguar XJ V12 Exhaust Manifold Headers set of 4

    Jaguar XJ V12 Exhaust Manifold and Jaguar XJ V12 Exhaust Headers (set of 4 manifolds)

    High-grade stainless steel Jaguar XJ V12 exhaust system manifold and JaguarXJ V12 headers made to order in original factory style.

    Paramount offer an unrivalled range of classic Jaguar XJ V12 mufflers, headers and exhaust manifolds for the complete range of Jaguar cars, including the Jaguar XJ V12 manifolds and Jaguar XJ headers.

    All of our Jaguar XJ V12 exhaust manifolds and Jaguar XJ headers come with a lifetime corrosion warranty too

    Exhaust Systems and Jaguar headers and Jaguar manifolds for most Jaguar cars, if you are not sure, or if you don’t see what you are looking for please e-mail us – we are here to help.

    Paramount the home of the Classic Jaguar performance exhaust manifolds and headers.

    SKU: SKU1752811211111121221 Categories: , ,
  • Jaguar XJ 6 Supercharger Pulley – Lower Pulley kit

    Jaguar XJ 6 Supercharger Lower Pulley Kit


    The Jaguar XJ6 with the straight 6 engine has a different supercharger pulley than the later V8 engines where either the top or lower pulley can be changed, on the Jaguar XJ6 it is just the lower supercharger pulley that is upgraded. The good news is it is very much easier to fit than the later V8 engine version. On the Jaguar XJR-6 it is a simple bolt on / off operation.

    Jaguar XJ 6 Supercharger Pulley

    Jaguar XJ 6 Supercharger Pulley


    So why not bold on some more power for your XJR today


    The Jaguar XJ 6 Supercharger Lower Pulley kit also comes with a new high quality belt too, ready for fitting. The kits are available mail order with worldwide shipping, or we offer a full fitting service at our UK workshops




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