I installed and ran my 2009 Jeep JK but didn't notice a difference. I took it out on the road and heard a noticeable change in sound as I accelerated and my wife said she felt the pickup too. It was snug and meant for JK. I've been listening for a whistle but I don't think there is one (according to previous posts). I wouldn't even upgrade the exhaust now. I wish I had made it in '09 when I bought it.
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