Magnasteer is pointless in my eyes.
I've driven plenty of w-body's with and without it and I don't see a major difference at all.
I hate my GXP magnasteer. Like a Cadillac with one pinky to turn. I like to feel the road.
napa doesn't carry magnasteer, asked at the store. then, called the dealer and they wanted my vin, then they told me that my car doesn't have that feature and i cannot add it!!!