Using these engine mounts is straightforward. Just remove the old OEM parts (the ones it replaces are listed in the product description) and install the new KEIN engine mounts in their place. Make sure to use the correct mounting plates if your car is a 2006+ WRX or STi. As for maintenance, it's pretty simple. Check the bolts regularly to make sure they're tight. If you notice any signs of rust on the powder - coated surface, you can touch it up with a matching powder - coat paint. Also, keep an eye on the rubber bushings. If they start to show excessive wear, it might be time to get them replaced. And remember, since these mounts make the engine noise a bit louder, it's normal. But if you hear any unusual noises, it could be a sign of an issue, so it's best to have it checked out.