Do a search on cold air intakes. I was able to test one. It did not increase my mileage or give me any notible power gain. The test was done going 300 miles in a day. The next day, with about the same temp, I drove the same speeds as the day before, and went to the same place. I didn't use the EVIC system but actually filled the tank, and then took the mileage at the next fillup. The difference in mileage was .1 mpg. IMO, it is a waste of money. I bought a washable air filter to replace the original. Oh, this was on my 2013 JKU.