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Originally Posted by 6spdhyperblue
U guys have any luck?
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I welded my secondary cats back in made it about 20% quieter and got rid of most of the drone. I also pulled the npp fuse and rattle is gone forever. It also sounds better because you dont hear it open and close from when your revving in neutral. I think the flowmaster npp sounds fine without any other mods and is not too loud to make any neighbors angry.