I ran the old thrush turbo 400 for years...cannot find em and tried flowmaster, and magnaflow and both are too loud and drone...switched and bought dynomax super turbos
there not bad, quiet at idle and nice steady rumble at 3000 rpm at highway speed, no drone but a little loud at WOT for my liking....but my exhaust does dump right at ear level outside my windows. 2 and a half inch headpipes and 2 and a quarter tailpipes