Rebuilt the 350 in my '57 3/4 ton and had new exhaust done. The guy sold me on a pair of "Chrysler Hemi" mufflers. They are big and he said they would be quiet but not too restrictive. Dual with a crossover pipe and ended them just in front of the rear end (hydraulics for the dump bed make it a little challenging). They have a funny tinny sound out the tail but in the cab they seem to have developed a low frequency hum that resonates so bad, it's like a really bad toothache. Wondering if it's the mufflers or the fact that I didn't run the pipes all the way back? (He did say I can come back if I don't like them.)Any exhaust experts out there?
