They say the mach 1 restrictor plate can be used on all stangs. The mach 1 plate is made up after the mach 1's IAC valve. The mach 1's IAC valves air in and out holes are perfect circles unlike the v6 stangs IAC air in and out holes which look like triangles with the tops and bottoms cut off " a odd shape." Now wont the plate made for the mach 1 restrict even more air since the plate holes are perfect circles- rather then the oddly shaped triangle holes on the v6??