I just finished making and installing the plate. Used 9/32 opening. Engine idles fine,even with a/c on. Rpm drops faster and feels great. The one thing i have noticed is there is less exhaust "burble" than without the mod. My car had a very pronounced "burble" and with the plate there is none. Any thoughts on this. It seems to be opposite to what others have observed. My Mach is a 5 speed and no other mods.
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