The Armaspeed replacement filter can be changed at your discretion. We recommend at least changing every 10,000 miles. Here at the shop we swap ours out every 5-10k miles. This filter can be used with other 5 inch filter attachment applications with a attachment coupler diameter of 125mm. This filter matches the specs used on the MKV MK5 A90 Toyota Supra GR filter used in the Armaspeed intake system.