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I just did a week ago, did not notice any performance change ,my mpg went up a bit and its loud........ verry loud, i live in a sub division and a cold start at 5 am makes my neighbors mad so im going to try and weld in a 12 inch glasspack this weekend to see if that makes it just a little bit quieter. Cab noise is also stupid loud on takeoffs but while cruising at pretty much any set speed it is just fine with the radio on .overall ,to me its just not pratical for my stop and go city driving.
I would keep a muffler in just for backpressure reasons (yes I've read a bunch of the fights about backpressure) but cutouts would definitely be the best choice
I had a hole in my pipe between the cat and muffler, it was loud, sounded pretty mean, but it was obnoxiously loud at everything but cruise. Pretty noisy at idle too.
Keep muffler and weld in a cut out after the cat but before the muffler. That way when you want it quiet like a long highway trip, or near cops, etc, then it can be.
Yeah, on mine I have Pacesetter LTs, no cats, X pipe, dual DMH cutouts and then dual Magnaflow 4x14 round mufflers. Even with the cutouts closed it can get pretty loud but with the cutouts open.......OMG. Its goes from bad to worse....in a good way
LOUD...I had straight pipes on my truck for a whole 5mins(just wanted to see how loud it was without cats and muffler) and it was just too much but that's my opinion I know a few guys where I live that love it