I'm going to write another thread about te air dog shortly but it looks like the jacobs is out the door. Nothing but problems. It is a great system for stock trucks. I have friends who have them and no problems for eighty thousand miles. The air pumps do go, but so does every other moving part in the world. It just is not a great system for aftermarket parts. I installed the htt turbo and had to beat the heck out of the fire wall so that the canister does not hit, and now this. By By Jake.