Worst mistake I made. Driving a Mercedes equipped with AirMatic suspension should be a comfortable and soothing experience. After all, the smooth ride of a fine German luxury car is legendary! But as these vehicles age, the active air suspension system develops malfunctions. Here's my mistake, I replace this luxury ride for the Strutmasters conversion. Strutmasters conversion kit took a beautiful and enjoyable driving luxury automobile to that of a Dodge. Strutmasters didn't want to help and tried to avoid the issues I have at all costs. I can no longer enjoy my Mercedes to the point that I’m replacing the entire system back to the original Mercedes airmatic. The lack of customer service the fact they don’t care about you after the sale plus the crappy parts, wrong ride height, noise coming from the new parts, the unsafe freeway handling is the only reason to not buy from them ever! Check them out on yelp and other review sights too see just what other people say before spending your money and wasting your efforts.