I had an HKS unit on both my Supra and my FD and had no issues. The only reason I ever changed the one on my MKIV was to go to larger piping. If you take care of your shit, I don't see why you'd have problems. BUT, this was in Texas, and salty air wasn't constantly jocking my shit. Since I've been here I've had all kinds of little issues come up with tuning, paint, etc etc etc.