What brand exhaust brake do you have? I rigged one up on my '01 350 using the factory warm up butterfly. I'm happy with the performance, I'd say it's like a 3 position Jake on level 2. I need to hook up a switch to the torque lock up though to make it really work. My '02 has a 6 speed, I'd like to do the same to it, but things are so busy now it will be a while before I can. Would like to do a mild chip thing to make these things blow black smoke like a real truck!