If you weren't aware, the ATI dampers will not support the OEM style trigger wheel and they must be modified to fit. We've taken the liberty to custom machine these 4, 12 and 60-2 tooth timing wheels to remain compatible with BOTH dampers. This design allows you to either install directly onto your OEM Mazda damper or snip out the center and install it to your performance ATi Dynamic Damper. Keep in mind, you SAVE on this setup when you purchase an ATi damper and simply add it as an option on the product page HERE. These allow you to properly configure AEM, Haltech, Adaptronic, Megasquirt and many other aftermarket management solutions.