The next stage is to improve the exhaust system. We offer stainless steel systems, with or without catalytic converters (only a legal requirement in the UK in 1993 onwards), and with minor to major torque and power improvements. Options include standard stainless steel, large bore and the top of the range system with tubular fabricated manifolds. Various degrees of extra noise is inherent in the performance systems. Power improvements can reach over 15% for no reduction in fuel economy.

This has broadly the same characteristics as OEM system, except that it is entirely heavy-gauge stainless steel and will last indefinitely. No performance gains are claimed but as a new system it will not be clogged-up at all so the initial power will improve.

Being a larger diameter there is less restriction so power is improved by around 5%, and there is a deeper, louder noise.

This is the ultimate system with hand-made tubular (as opposed to mass-produced cast iron stub manifolds) and straight-through silencers. This improves power by around 20% at 1500 rpm to 3000 rpm – just where you need it.

To measure any improvements, we also offer before and after Dyno testing.

For best optimisation of add-on performance parts such as a different exhaust system, and to get the best power for that particular engine (they all came off Jaguar’s production line in very different states…) one needs a re-programmable fuelling and ignition computer, aka Digital Engine Management. See here for more details. This will achieve increases in power of around 10%.