I no longer have my MK2 vRS so have this Tuning box for sale. It takes literally a few minutes to install and is simply a plug and play unit- remove the engine cover that simply pulls off, unplug the feed on the common rail underneath and plug the tuning box in.    I thought It made a noticeable difference to my vRS, the car seemed far more responsive with it fitted and I used to get decent MPG too. The website claimed up to 10% hp improvement, so my insurers (Admiral) didn't want any