This bushing will work with engine intake manifolds that have been modified to accept our new XIRT series products. The bushings will allow quick and easy installation back to factory port sizing to test factory stock injectors with and without our Super(charged) Fuel Injection system. In addition, should you be wanting to sell the vehicle without the Super(charged) Fuel Injection modification, these bushings can be left in the vehicle along with the stock injectors. Available for order now at www.dynoblade.com