I have ran my truck with a straight pipe since I got it.:evil: The only time I noticed that my truck was louder than stock with a tune in it was when I got on it. At idle, I haven't noticed any difference. For example, to match how loud it was stock would be like giving her 1/4 to 1/2 throttle. If that makes any sense. I am sure that a muffler would make some of that difference up.:shrug:
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