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I also have a fluttering noise when I'm cruising in low rpm, but it's extremely quiet at idle. Curious to see if it's my donut gaskets at the header/cats. I had a shop tell me it was coming from my acm muffler mod, but looking for a second opinion as I can almost hear something under my seat below 3k, anything above that sounds normal. I've never heard of an oem muffler mod going bad. Hopefully someone could chime in before I tell a muffler shop to open up my oem muffler to check welds. When you replaced your x pipe, was a new donut gasket installed? I'm on oem x pipe and it was never removed from the car. My throttle is also sluggish, it's gotten to the point where I hate driving my car cause it sounds like trash. The sound is so embarrassing and pronounced going uphill
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