RPM427 - I have never had any experience with them, but I hear that the Dynomax have a pretty controlled sound and are still a great performance muffler.
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'90 GT Under construction
Best E.T. = Fast @ High Speeds - OK So I Lie. So What!!!  
04 F-150 STX 4.2L 5 spd
Rice Haters Club Member #128
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