Special DSM fit ONLY Fuel Injectors! Upgrading fuel your fuel injectors is a necessity when changing turbos, intercoolers, boost, or modifying engine combinations. That is why it is important to insist on the best. Our fuel injectors are flow checked, individualy scribed, hand selected, and then carefully matched to within 1% of each other for optimum performance in your car. These injectors are a direct replacement for the stock units and do not require any fuel rail modifactions. They have a 1000cc flow rating and are of a ball and seat design that has an optimal spray pattern for perforrmance