I'm no exhaust flow specialtst, but I would think that having a muffling device inside a pipe the same size as the rest of your exhaust would be restricting as all get out. Just my .02.
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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
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