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I have 6.0 03 4inch from dp back no cat but muffler great whistle buit i want moreeeee I know get rid of muff- but does it get louder (engine sound --in cab ? Dont care out of cab also i thought of just spinning muffler around (if you looked in muffler you have directional tabs) or can i just buy a pipe from gus @ fbd and cut off muffler and replace with pipe is it that much louder dont want wifeee to lose her face
 

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nah, 6.0s dont have much loud engine noise until you get up to about 2700 rpms, almost everything before then is just insane whistle:thumb:
 

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they make a muffler delete pipe that will just bolt in place of the muffler, truck will be LOUD at WOT but not bad in the cab
 
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