a few headaches or that I used 4" spacers for the airlift (the website says that a 6" spacer doesn't mean you need a 6" spacer, so I used a 4" spacer for a 5" spacer; side to side looked exactly the same height together as the old airlift and the spacer set next to it. And on day one the driver's side bag is filled to 40 pounds per square inch (as is the passenger side), and within 10-15 minutes later it's losing all 40psi with no audible leaks?!I am I'm pretty sure 1 of 2 bags came defective! that I love this brand and they looked great under my truck.