My apologies for not having a direct answer to your question. However I just wanted to mention that there is a significant comfort penalty with the massage seats. They are much less plush, less cushioned, and not nearly as comfortable as most seats. In fact I would say that my 21 ST seats are about the least comfortable I've ever sat in. NOT that they are exactly "bad"...they just don't have any soft cushion to them. Very average feeling, not really that great at all. Disappointing. This has also been mentioned in some professional reviews of the car. The lack of padding in the massage seats is my second biggest disappointment with the vehicle, after the harsh, stiff ride (don't get me wrong, I still like the car overall). I was at the Cleveland Auto Show last weekend and sat in a newer model and it was striking how much softer and more comfortable those seats were. So much so that I'm actually considering looking into swapping mine out for newer ones. I don't use the massage feature that much and would much rather have soft, comfortable seats every single moment I'm in the vehicle. So I would just encourage you to carefully compare them both before making a decision. Personally, I would swap out of mine in a minute if I could.
