Using the K&N cold air intake kit is easy. First, make sure your vehicle's engine is cool. Then, follow the step - by - step installation guide included in the kit, which usually takes less than 90 minutes. Once installed, you'll notice an immediate improvement in your vehicle's performance. When it comes to maintenance, under normal highway driving, you can go up to 100,000 miles before servicing the filter. To service the filter, simply remove it and wash it with a special filter cleaner, then let it dry and re - oil it. Before you use the kit, check the product specifications to ensure it's legal for your vehicle in your area, especially if you're in California as some intakes aren't legal for pollution - controlled vehicles there.