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I had never heard of those, so I had to look them up.

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i have dual hornies under my shelby dakota. i was running them where the catalytic went, but the exhaust was coming in the back window. there was some droning, at certain rpm's, but it wasn't intolerable. i removed the hornies, went with a flowmaster dual inlet/outlet 40 series where to cat was, and used the hornies for tips at the back bumper. still plenty loud, droning eliminated. (or is making the drone behind the bulper, where i don't hear it anymore) hornies rule!!