I recently bought a 2007 lincoln Navigator. I knew it needed a few things fixed on it when I bought it . First thing I had to fix was an exaust intake manifold, the going rate in general for an exaust manifold for most vehicles is between $400. to $600 but because it's built by Ford it doubled to $1200. each side. But I figured what the heck since the main other thing was the air suspension. I figured hey suspension no problem it's basic right. Not I just get to fixing the air suspension after shelling out $1200 just for the one exaust manifold just to find out that Ford does not make the solenoid that I need to fix the air suspension and the only choice I have is to convert it to coil over suspension.the vehicle isn't even 20 years old yet.