Every Havoc Intake Manifold ships with pilot holes pre-drilled for an easy port fuel addition. When it’s time to add port fuel injection, the customer can drill these holes out at home with a simple hand drill. These holes along with this HavocRail allow for port fuel injection for maximum gains.

With the addition of port fuel, your Mazdaspeed can get incredibly efficient fueling using the stock direct injection alongside this secondary fueling system. This duel fuel setup allows for you to run 4 additional port fuel injectors alongside your overworked stock DI injectors.