Acura RDX owners - this A-Premium engine air filter 2-pack is exactly what you need for your 2013-2018 model! These filters are designed to replace OE number 17220R8AA01 and other compatible part numbers like AF5218, A5218, and PA6276. The fine filtration media does an awesome job capturing dirt and debris without restricting airflow, which means better engine performance and improved fuel efficiency. Each filter measures about 12.17 x 7.99 x 2.17 inches and has that irregular rectangular shape that fits perfectly in the front location. Since you get two filters in the package, you've got one ready for your next replacement too. Most manufacturers recommend changing your air filter every 12 months or 12,000 miles, but if you drive in dusty conditions, you might want to do it more often. It's not washable or reusable, but at this price for two quality filters, it's totally worth it. Such an easy maintenance item that makes a real difference in how your RDX runs. Definitely one of the simplest ways to keep your vehicle breathing properly and running smoothly!