What sort of supercharger is your customer contemplating, because there is basically two ways to go. You can go with an Eaton style that sits between the manifolds or a "hair drier" type like Vortech, Paxton or Pro charger to name a few. From personal experience, the Eaton supercharger gets too hot, and it's difficult to intercool it, and, at best you will only get around 5 PSI boost. Installing a smaller pulley to make it spin faster for more boost only works for a short while before it s**t's itself. The hair drier type can be run at higher boosts, but if the vehicle is a manual, you will experience 'Lag' which does not happen with either the automatic, or with the EATON fitted.
If your customer decides to supercharge; to do it properly he will need to have deep pockets otherwise, he had better carry a bucket with him.
He's a short list of what he needs:- Intercooling, bigger injectors, a fuel pressure regulator, a good aftermarket ignition system, leads, coil, MSD or similar, after market oil cooler, a computer system such as Haltech, or better still, a Motec, preferably a M48 or M48 pro.
Come back to me if you want any more info.
FWIW, once you have fitted a supercharger to any vehicle, Rover or otherwise, you will find it like a drug.
