Using this brake cooling deflector is a breeze. First, make sure you have a jack and jackstands ready. Park your Subaru WRX or STI in your driveway. You'll find an existing hole on the A - arm where the deflector will mount. Simply attach the deflector to this hole - no need to drill. Once it's securely in place, you're good to go. As for the rotor dust shield, it's a great idea to take it off. This will let more air reach the brakes and help them work better. When it comes to maintenance, give the deflector a quick look every few months. Check if it's still tightly attached to the A - arm. If it's dirty, you can clean it with a mild soap and water. Keep in mind that the deflector is made of high - quality aircraft - grade billet aluminum, so it should last a long time. Enjoy improved braking performance with your new Boomba deflector!