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I had to go with windsor shorty headers which run 4 into 1 with a 2" flanged outlet, then into a 2" bend and aftermarket cats. The factory Ford cats were way to big. Then ran into HQ factory mufflers through to tail pipes in a twin system. This was way to loud so had to add 2 more HQ mufflers beside the fuel tank just before the tailpipes.
So with 2 cats and 4 mufflers I was still 1dba over the limit but the engineer let it pass.
We did a pass by with a brand new BF GT and the GT was louder.
Now it is too quiet even after the middle two mufflers fell off.
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