I know that the fuel rail is different on the JDM H22a engine. I ran the f22a6 fuel rail out of my 90 ex accord motor for the same reason, the different side of fuel line it let.AEM Fuel Pressure Regulator – H22A/F20B. AEM Fuel Pressure Regulator - H22A/F20B. AEM’s Honda/Acura Adjustable Fuel Pressure Regulators are capable of supporting enough fuel flow for engines up to 1000 horsepower. Our patented interchangeable discharge ports enable the regulator’s output to match the output of any fuel pump.