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cats will be the biggest noise maker. i just removed mine, i have factory headers, bassani x pipe, no cats, and 12" glass packs, with no glass left in them. Basically i can be heard from at least a half mile, and that the front of my car, my dad apparently heard me coming, thought i was down the street, didnt show up for a few minutes. haha. LOUD
If your gonna run lm1 get a off road h not x it takes away most of the popping annoying rasp..cracking. Expectially when cold. Had that setup very loud but with no back pressure I lost power:/