1993 Jeep Wrangler 4.0 with K&N Cold Air Intake. calms down around 2k, after 2k you only hear it when you accelerate. He gets a volume of about 3-3.5k again. That's as much as I take the AMC-242 4.0 motor, so that's all I know. I could not find any disturbing salon resonance. Keep in mind that this is about 2-3 inches shorter than the OEM muffler.
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