Offroad X-pipe and single chamber flows if you want the loud all the time. MM&FF did a test of several mufflers including 2 chamber flows and Bassani and others, and the Flowtech Warlock with the plug removed had the highest numbers as far as decibels.
Caymon
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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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