Ok everybody, Here's something some friends of mine have been working on for a while now! It is an actual 6 cyl, hydraulicly actuated mechanical engine brake for a 12 valve cummins! It has a timed pump actuating 6 individual hydraulic cylinders mounted in a billet valve cover! I will post some pics later when they clear it, but here's the YouTube link for one of the road tests we did! This thing Really works! It's not just a "leaker" brake like the one sold for the 24 valve, but an actual compression brake like a "Jake". http://www.youtube.com/watch?v=WncV8Hl3e_I Hope ya'll enjoy this! BTW: They are starting development for the 4 BT, the 6BT 24 valve, the IDI Ford and the 7.3 Powerstroke engines!!