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I recently did my exhaust. I used eBay headers and eBay secondary cat deletes and stock muffler. I can tell you that it is really quite while cruising and accelerating but can get a little loud at wide open throttle at times. Not obnoxious at all and sounds really good. I also installed them at first using an O2 spacer and that didn’t set off my CEL at all and my emissions were ready except the SAI system. I was clearing codes almost weekly as my SAI was throwing codes but nothing else.
If you can go back to the dealership and convince them to put on a row tune, it’ll solve some issues unless they do emissions check where you’re at.
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