I can chime in on the exhaust brake... I just installed a sps 66 last saturday on my '06 with a factory installed jacobs exhaust brake. After bolting the turbo to the exhaust manifold, I had to rotate the exhaust slightly to get it to match up the to the turbo. However, in doing this, the vacuum pod for the exhaust brake is now touching the firewall of the truck, and you can hear it knocking against the truck when starting and stopping the engine. There doesn't appear to be much manueverability in the ways to mount the pod... i've egged out one of the holes, cut away the insulation on the firewall, and even indented the firewall slightly to try to gain clearance, but it's still not enough. I'm not familiar with the pacbrake's mounting, but it may be a better option for you. Additionally, I'm not sure if it has to do with the backpressure change from the turbo, or if somehow I changed the adjustment on the exhaust brake, but it's efficiency has been greatly reduced... so much so, that although I can hear it engageing, I can hardly tell the truck is being decelerated at all. Hope this helps... Maybe someone else will chime in as well.