This might have been asked/answered already. But I have a 2011 accent. I want to put a K&N air filter in the car, or even the intake. I am not looking for a "racecar" I am looking for just better MPG. I want to know if either of these will void the warranty through Hyundai.

 

You won't get much better mileage with a K&N or a Cold Air Intake. I'd suggest sticking with the factory intake. Seriously.

 

Second that, I had the Short Ram. Stay away! Stock on an engine this size if fine. Better option would be to get some lighter weight rims, but gains would be very small.

 

I see no issue with buying a K&N filter, if you are buying it because you don't want to ever have to buy another air filter. I have bought them for everything I have owned. Honestly though, these guys are right when they tell you that you probably will not see a gain in MPGs.