I love the aggressive sound, it sounds mean. I wouldn't say I'm unhappy with the 3-4k buzzing, you take the muffler off a car and your going to get a few things that aren't perfect. I'd say if you want loud, you'll get your money's worth. I have 2013 Z and it never saw a winter, but I soaked the bolt with WD40 a few days before I did the job and a 14mm socket and a 18" breaker bar - no problem. Install was a simple one man job, I'm no F1 technician or any technician for that matter and I thought it was no sweat. I had excellent customer service from Khoi at AAM and have loved cruising around with the windows down the last 2 days. Car just sounds bad ***.
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