This adjustable fuel pressure regulator is absolutly neccesary when modifying your Firecat, M Series, or Crossfire EFI. Allows you to simply crank up your fuel pressure to accomodate modifications such as pipes and big bores. Easily install it yourself with the included instructions. The BMP billet cover has a fine threaded adjustment so that you can fine tune your fuel mixture richer or leaner than stock by adjusting the pressure from the pump to the injectors. It is easily adjusted and comes with a nice inline pressure gauge for tuning. Works great on stock, ported and big bored motors