Skilled technicians who have the proper tools and training should correctly and safely add the equipment to your vehicle. Buyers will be responsible for all risks on any installation method. We won't accept any claim after 14 days upon item receive. What customers should do is to make sure the item is in the original packaging with the order number issued by our company Xpert-Tuning, clearly marked outside the box.During the high season time, there might be times that popular merchandise are backorder, we do try our best to keep the inventory accurate for the item that we list. There might be chances that the item is out of stock before we can stop the listings.