Good lord, a tuner has become lost and is here to have his bones picked clean Your problem is not the Porter mufflers, the problem is the POS that they are mounted on Maybe you should read what this forum is all about
Our '47 has flowmasters. I don't like them but that's what was on it when we bought it. You see a '47 Hudson but hear a 5.0 Mustang. I would NOT do flowmasters.
I wonder what ever happened to the original poster? he never did say how he liked his mufflers 3 years ago... kinda weird. I have porters on my 40, my corvette, my 61 impala and my off topic 66 chevelle and I really like em
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