My wife recently puchased for me a '91 NSX as a birthday gift. Obviously the best birthday gift ever and a wife most guys only dream about. I guess she got tired of me constantly talking about getting one and staring at them for hours on the internet. Anyway, I was very surprised to find my NSX did not have aluminum calipers. We own a polishing shop, and having polished aluminum calipers on "lesser" vehicles (mustangs, firebirds, corvettes and almost all motorcycles), I was dissappointed to find mine were not aluminum. I realize that all of the vehicles I mentioned were much newer than my '91, but the NSX's were so far advanced in all other aspects, why not this one? Anyway, I am hoping that later models did use aluminum and that it would be a simple bolt on swap to put them on my car. Can anyone out there help me? Thanks.