Using your BC Racing BR Series Coilover Kit for the Nissan 350Z is straightforward. First, locate the adjustment knobs. You can use them to adjust the damping levels, which have 30 different settings for both compression and rebound. To change the ride height, make use of the separate adjustment feature. You can set it according to your driving style and how your car looks. When it comes to installation, it's a good idea to have it done by a professional mechanic. As for maintenance, regularly check the coilovers for any signs of damage or leaks. The locking ring should be inspected to make sure all adjustments are still secure. If you notice any issues, contact us right away. The coilovers are rebuildable, and individual parts can be purchased separately. Remember, custom kits take up to 8+ weeks to ship, so plan your installation accordingly. The rear extenders, if you choose to get them, are an easy - to - use accessory that allows you to change the dampening range without the hassle of removing your rear seat every time.