We had a chance to mock up an SRT-4 head with the Hahn Racecraft Port Fueler on it.
The port fueler adds a manifold spacer with bosses that fit four additional injectors. The extra set is wired into the Hahn RaceCraft portfueler controller. This set up eliminates the need for the return line style regulators and high flow pumps. In normal driving the stock injectors will supply fuel as usual and in boost the second set will begin supplying extra fuel. These kits are a great match to the HRC 16G and 20G upgrades.