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it's also important to call out that the rear muffler can also introduce low end bass and extreme NVH depending on age, style, and design. It's not just the x-pipe configuration that causes rasp/NVH problems.
I had an RPi GTM axle back exhaust and completely stock x-pipe and the amount of deep low-end bass and NVH that muffler setup caused was INSANE. It would visibly rattle all of the interior panels at idle and below 2500 rpm. It sounded like had two 15" subwoofers in the back, and Im not even joking. Funny thing, was that at redline, the car was the quietest and would get louder the closer to idle you were.
I swapped to the Corsa axle back and test pipes and the car sounds awesome now with zero rasp or unwanted garbage sounds.
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