While I have the heads off, I am thinking about replacing the early 99 intake plenums with later model 3" ones. At this time, I don't want to replace the spider or any other plumbing. Question is this: Do the inlets fall in the same location on both, so that all I would have to find is a 2 3/8" to 3" reducing boot to connect the early 99 intake spider to the 99.5 intake manifolds, or is there more to it than that? Also, will the early 99 turbo clear the 99.5 intake plenums? I have heard that OBS guys had to do some BFH massaging of the intake plenum at the turbo to get it to clear.
99.5 F250 Lariat : 6" lift on 37" Toyo MT's, DP Tunes, Built Transmission, Airbags, AIH Delete, 38R, Banks Big Head, CCV Mod, Sinister Regulated Return, IH bellowed up pipes, AFE Stage II, ISSPro Performax gauges, Scan Gauge, Casserly Stage I's, T-500 HPOP, Swamp's IDM
hey i sorta did what your talking about only i did it backwards lol I have a late spyder with early plentums... I got the reducers from some silicone website and they work great and everything lines up
They will probably clear... the early 99 pedistle is way higher than the OBS ones so i would think it should clear pretty easily.. im not 100% but even if it did take a little massaging to get it in there it wouldnt be much