I bought 2 of these in a full dual exhaust system for a Chevelle 69 from NPD. Full exhaust from headers to rear bumper. Much louder than stock. My car is a 350 V8 with a full factory exhaust - no headers. Nothing special. It is possible that these mufflers were designed for use with a catalytic converter. Good for a car show where everyone likes loud whistles. They are too loud for everyday use. They have a good sound, good tone, but too loud.
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