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My Dad runs cooler then stock with the SMARTY programming. There still isn't enough fuel there to worry about running too much boost. It isn't demanding enough fuel to starve the factory lift pump, and it doesn't bump the timing enough to worry about high cylinder pressure... It's a win all the way around :redneck:. My Dad put a new clutch in his with the SMARTY. But he tows an 18k 5th wheel as well as a 7k lb and a 12k motorcycle trailer. He has the full blown Smarty (Jr wasn't out yet), so he bought the clutch to be safe.
