Differences between a Early 99 and Late 99 7.3
Its the IAT sensor...
You have a E99...
WW is a E-99 compressor wheel. It has stepped blades and moves the surge line on the turbo a bit... Customer complaints on the E-99 trucks made Ford change the design, and also add the insulation on the L-99 and on.
With a E-99 you already have one!
With a E-99 you already have one!
From what I've read the WW flows less air to try and reduce surge. Since you CANNOT get a ported compressor housing for the E99, it (has a 4 bolt compressor housing), later models have a 5 bolt housing. As for the surge line, I have no idea.





