I have a 77 Ramcharger which oil levels dropped to a point where the rocker arms made the same sound.
either that or it's a header exhaust leak.
i only hear a mild humming with my car, so that sound is anything but normal
I got the Borla 140557. haven't installed it yet, but i think it will have a humming noise on long drives.
if you're keeping it a family car with kids in it most of the time, i don't think you will like the extra noise
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