I installed one on my 99 2wd 6spd 7.3l supercab,it really smooths out the clatter and shake of the engine at idle & seems to even out fuel delivery to all injectors.I got mine made at a local specialty hose fab shop for $12.just brought the plug off the oil galley. I had them make it 16" long but it would have went on easier if it was 18" long instead.still fits,just harder to get on
