Don't want to be responsible for someone else's choices, but I bought the cheapest Chinese Hitachi knockoff available on Amazon and had my mechanic friend install it and it has worked just fine. It cost like $135. I told my mechanic friend not to install it if anything looked off. His opinion is the knockoff part looked identical to the Hitachi. Didn't need to reprogram anything. It was plug and play and it worked. I was getting random suspension fault codes before that and haven't got one since the swap. How long will it last? No idea. My mechanic friend was like, "It's an air compressor for the suspension. Nothing magical about that." Maybe it's just one of those items where the generic knockoff version is fine, given what it is intended to do. Or maybe I got lucky. But it did open my eyes to the fact that you may be able to get by with bargain basement parts on some things rather than paying top dollar. I looked into the kit to completely refurbish the old Hitachi (which I still have) and my sense is it was almost as expensive as the newly manufactured knockoff. Given the fact the new part seems to work fine, it just doesn't make sense for me to mess around with servicing the old one.