1. Initially, you have to identify the K&N Filters discount code you're keen on from this page and click on Get Code, located on the right side of the title.
2. With a single click, the offer code will then be displayed and auto-copied to your clipboard.
3. You'll then need to return to the K&N Filters's shopping checkout page, where you'll find the promotional code box and paste the coupon code you just copied into it.
4. Now you can click directly to Apply Code, and the current order has successfully enjoyed the discount.