Using this timing belt guide kit is straightforward. First, make sure your engine is off and cooled down. Remove the old factory timing belt guide. Then, install the new Company23 guide from the kit using the included stainless steel hardware. Adjust the slotted mounting holes to fit your specific timing belt. Use the timing belt spacer tool to accurately set the gap for all four guides. When it comes to maintenance, regularly check the guides for any signs of wear or damage. Keep them clean to ensure smooth operation. Also, during engine tune - ups, it's a good idea to inspect the timing belt and guides together. Always follow the manufacturer's recommended service intervals. Note that this kit is specifically designed for the listed Subaru and Saab models with DOHC Turbo engines, so don't use it on other non - compatible vehicles.