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Anyone simply swapped the stock muffler for a "Chambered" or "glass Pack"? I saw a 2003 dumped after the cats with no muffler or tailpipe and it wasn't that loud, so I wondered if a straight through muffler would sound better than stock and make a couple of extra horses on a fairly stock 5.3 ?
I have I put a Dynomax race bullet in place of the factory muffler and its dumped before the rear axle and it sounds good. better than a glasspack imo. just get a 3 inch inlet and anything will work.
yea i just put an SLP loudmouth 1 on my truck. with a 2.5" inlet and outlet. it isnt too loud and if u downshift to like 2 at 40mph it backfires and pops. sounds pretty sweet and we welded it in, in 40 minutes!
A Flowmaster 40 series its wat i been using for 6 months