I have a mrt catted h + borla stingers and my 4" borla tips were looking a little ratty. I replaced them with SLP 3.5" tips. My car is quieter at idle and cruise with noticably reduced drone. The drone is almost nonexistent now. If some one would have told me a tip changed the sound+drone this much I would have put up the bs flag. Much more enjoyable to drive now and they look sweet. It seems to have smoothed out the sound also. FYI
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