Using this FactionFab brake rotor is straightforward. Just replace your old front brake rotor with this one according to your Subaru STI 2004's brake system installation guide. Make sure to clean the mounting surface before installation to ensure a proper fit. When driving, you'll notice improved braking right away. For maintenance, regularly check the rotor for any signs of excessive wear or damage. If you see any deep grooves or cracks, it's time to replace the rotor. To keep the e-coating in good condition, avoid harsh chemicals when cleaning your brakes. Just use a mild soap and water to clean the rotor. This will help maintain its corrosion resistance and keep your braking system performing at its best.