If you are trying to maximize your engine's performance, than you need to have some monitoring systems in place far beyond your typical engine management. Fuel delivery is the key to engine performance, and that is why knowledge of your fuel pressure can really tell you a lot about how your engine is running. The fuel pressure regulator is designed to keep your fuel pressure constant for the conditions. A high quality AEM fuel pressure regulator is one of the best upgrades that you can make to your fuel delivery system. A failing fuel pressure regulator will cause your engine to run very inconsistently, and it can be a difficult problem to track down. The small seal within the regulator is prone to failure, and to avoid problems in the future, replace it with a more durable, performance oriented AEM fuel pressure regulator. The AEM fuel pressure regulator is designed with strength and durability in mind. It is made in the United States out of the best materials and using the latest construction methods. The AEM fuel pressure regulator can really provide peace of mind, and can make a big difference in your engine's performance. Auto parts buyers desire professional technical support while buying quality car parts. So of course we make available a 24/7 service call desk to address your needs. Nobody likes to pay for shipping, so we always offer completely free shipping for every order above $50. If you can find a better price, let us know - we will beat any legitimate auto part price.