Just a quick into, I have recently purchased a 2009 Jaguar XJL 3.0 Diesel, it already has a remap to 335 bhp but I am thinking of more. An exhaust is a good start but what else is out there to make further improvements? Is there any way to improve supercharger cooling? of handling? Or anything else worthwhile? I would much appreciate any advice as well as where to buy the necessary gear. Thanks in anticipation, Keith