Description Reviews MINI Cooper S John Cooper Works 380cc Injectors. This is a plug and play option for a bit more injector with out too much work. It is still best to tune the car to get the most of your car. Not only will you get more horse power, but you will also get better MPG by doing so. These injectors are brand new OEM units, not a rebuild or re-drill. Sold as a set of 4.