Hi I am looking to convert the air suspension on my x358 to steel coil. How much have you paid to have someone do this for parts and labor in the US?

 

Put your question into the Forum's search Box and you will be inundated with excellent information!
Incidentally, do it yourself; it is a piece of p*ss and far, far cheaper!

 

I did this conversion on mine after wasting a couple of years and way too much money. I found an Arnott kit on Rock Auto for $1250 and installed it myself in one short day. I think that at the time the Arnott kits were about $2800 which is why I wasted my money elsewhere. By the way, I tried using the cheap Chinese replacements and got very little satisfaction.

 

As EsRay said, not hard do, & save yourself some $$$.
Become better acquanted with your Jaguar.

 

Same routines if you are replacing with Coil Overs...

This was my choice. Gave me adjustable ride height and damping, 15 points towards Firm and 15 to Soft 03-09 Jaguar XJ – BC Racing

However, you need to check your ability to remove 'Air Suspension' faults and 'CATS System Faults'. With mine (2005 XJ8L), all I needed to do was disconnect the Air Suspension Module and put one of these resistors (1 kohm, 1 W) https://www.jaguarforums.com/forum/x...2/#post2156428on each of the electronic connections to the existing Air Shocks:

 

The Arnott set comes with a module that disabled the CATS warning light, and I believe they now offer a coilover set with CATS.

I changed mine out after chasing the faults for a few months after I bought my car, and have never looked back. It rides better than it did before, I don't have to wait 5 or 10 minutes every morning for it to raise to drivable height, and I can go farther than 10 miles from home before i have to park and reset the car to bring it back up.

If you have jackstands, it's an EASY driveway job to change out yourself, unless you've never operated any kind of hand tool more complicated than a dinner fork. The Bilstein videos EsRay posted above are the exact same procedure with coilovers, other than the fact that you won't be reconnecting air lines, and there is no need to wait for the struts to pressurize before you lower the car. It's actually more work to get the back seat out of the car to access the electronic "black box" to unplug it and connect the CATS override module than it is to change the struts.

That CATS override module is what makes the Arnott kit worthwhile, as most of the kits don't have it, and you're stuck forever with a yellow warning light on the dash. I think one other vendor has the module, but I don't recall who, and someone figured out a resistor marix to use to fool the system, but I can't find that now, either.

 

I have no objection to the Arnotts set whatsoever, but I did find that I did not need their CATS overide, A simple and cheap resistor (1W-1-1K-ohm-1Kohm) fitted to each of the electronic connections to all four of the Air Struts has worked perfectly okay to erase the CATS warning message for me?
However, my understanding is that 2006 onwards models need more attention to their Air Suspension Module than mine (2005)?
Mine simply needed me to disconnect the module and I have had no Air Suspension or CATS errors on my dash ever since?

 

That is indeed the case. 2005 and earlier, all you had to do was disconnect the module and it didn't care. Later cars will display a CATS error and a permanent yellow warning light unless the override module is installed (or the correct resistors at the strut connectors.)