Using this Kein trunk brace is easy. Just install it on your 2002 - 2007 Subaru WRX Sedan or 2004 - 2007 Subaru STI Sedan following the included instructions. When driving, you'll immediately notice the improved handling. As for maintenance, check the brace regularly for any signs of damage or loose bolts. If it gets dirty, you can clean it with a mild soap and water solution. Make sure to dry it thoroughly to prevent rust, especially if it's powder - coated. And remember, this product comes with a 2 - year warranty, so if you have any issues, contact us right away.