The lifespan of the K&N replacement filter is as long as the lifespan of your bike. If your bike is serviced normally a new filter will be installed every so often. A K&N filter can just be washed and reused again. This saves significantly on the air filter and maintenance costs. With a K&N air filter you optimize the airflow to your engine. This provides better performance and better engine sound. Due to this feature, many people call it a power filter. This type K&N filter replaces the original filter in the air filter box. You open the standard air filter box, replace the original filter by the K&N air filter and close the cover. This type is fairly easy to install. Benefits of the K&N Replacement Filter 1. More power, more torque and better throttle response. 2. Water-repellent. 3. Washable, reusable. 4. Lubricate cotton of four layers for optimal protection. The oil layer acts as a magnet. Dust and dirt are retained on the outside while 40% more air can go in. 5. 1 million km warranty 6. Only clean every 80,000 to 160,000 miles. 7. The kit features a manual. Mounting: You can easily assemble the K&N bike replacement filter and just as easily disassemble it. On YouTube you can find plenty of tutorials to help you. If you still want to have help with installing your K&N filter you can always go to your AutoStyle dealer.