What does this do for a 7.3 diesel, I,m seeing this on many trucks even in the magazines and was wondering what the benefit is. Is it expensive or difficult to install on my own? who makes this kit, is it adjustable or just a higher idle, how does it affect the power steering? when I step on the brakes at an idle it is neerly impossible to turn the wheel to connect trailers etc would this help? Any info is appreciated.