The IMS to crank chain tensioner was updated with a preload spring to prevent the chain "flapping" if the tensioner oil leaks down, it is retrofitable with no other mods & I highly recommend this. The 2 cam chain tensioners have been updated but I didn't see any external changes other than 1 (4-6 bank I think) has gone to a 11mm allen from 32mm hex head for a lower profile. I am waiting for a good Webcertificate to order these for the engine I am building.
