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do you have stock exhaust or aftermarket? if you got a stock exaust system, the stock muffler is already flow through on the older body style powerstrokes, the cat converter does most of the work and is the most restrictive part. replacing that with a good muffler so you have 2 mufflers should keep it quiet and open it up at the same time.
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2016 F450 6.7L XLT 4x4Dump, bone stock
1994 F250 7.3L XLT 4x4 ZF5 , Centurion, 4" Lift, 6637, Gulf Coast Bypass Filter, Big fuel tanks, dana 60 swap, No longer dually
1997 F350 7.3L XLT 4x4Dump, E4OD, 4 in exhaust, TS 6 position, 3/8 Trans line+external filter
2013 Scag Turf Tiger 61" 1.1L Caterpillar Diesel
1960 John Deere 440 Backhoe 2-53 detroit