Need some advice,,,am gonna get a turbo for the ole beast,,,it is 91 f250extended cab 5 spd with a flatbed,,,strait pipe out the rear ,,,186000 miles on it,,,gooseneck hookup,,,,will haul a hell of a lot of hay ,,,runs d$%#~!~$#mn good,,,jus want some more outa it,,,,can someone out there give...