FYI,I have been running Dynomax on my bird for awhile with 2 1/2 all the way back over the axles.They were 14in.When I put my 434 RA V in the car with custom headers life changed!At 2000 my 14in were 86 dec,changed to 18in and it dropped to 84 dec and then went to a non performance 18in muffler and it went to 81.Still too much for my taste.The past engine was a 455 with long branch exhaust.FWIW.Tom
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