all the high end brands are going to be good. Toda, portflow, Manley. Skunk2 isn't like putting APC valves in your car, and as usual, lots of things are just blown up rumors about one person who had their valves mushroom. If you are concerned, and will be running very high RPMS and or very high lift, just go with the manley, portflow, or crower and have peace of mind I guess.