Using this K-Tuned exhaust is straightforward. First, choose the right flange option based on your downpipe. If you have an aftermarket 3-inch downpipe, use the 3-inch flange. For an OEM downpipe, the stock flange is the way to go. Install the exhaust with the included rubber hangers. When it comes to maintenance, keep an eye on the mufflers and the overall structure. Regularly check for any signs of damage or loose parts. Clean the exhaust periodically to maintain its appearance. Also, remember that some aftermarket downpipes may have a 2.5-inch stock flange size, so double - check before placing an order. And since this is a demo - fit unit, it was previously used for test fitting on a vehicle, but it's still in good working condition.