I was recently searching for the Cummins/Jacobs exhaust brake on Ebay. I ran across a seller that was a dealer in... . Texas I believe. So I bid, and got out-bid. The bidding started at $605. I called the dealership and asked how much retail was on the unit, he said $670. I said, well, I saw your ad on ebay, and bid, but was out-bid. He said that he usually works withe bidders, and if they are out-bid, he will sell the brake to them for the price at which they were out-bid. In my instance that is $615. I am asking is this a good deal, does he include everything that I need? HERE is the link for the auction. Let me know what you think. Is this a good price, how is the performance of the brake, does it look like all parts are included, etc, etc. Thanks