I have a 2016 Jeep Wrangler Unlimited (9500 miles). The included air filter was a cotton filter. The cotton filter wasn't that dirty. The new K&N filter immediately provided smooth acceleration and no difference in sound. I could immediately tell the difference in acceleration and nothing else at that moment. This is my second K&N purchase, first for a 2014 Jeep Patriot, and I also noticed smooth acceleration on the Patriot. I also experienced some MPG savings in the Patriot. I'll have to wait and see with the wrangler for mpg. I kept the K&N cleaning cotton filter.
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