Get ahold of MXMIKIE on the forum - he's in Quartzsite AZ and I believe he has (or had) a 3.5 plenum that was repaired already that he was trying to sell. I'm not sure if it was repaired back to correct functionality or just disabled through.

95 Montero SR
3.8 MIVEC, Advance headers, 2 1/2" exhaust, Magnaflow muffler, OME shocks & rear springs, 2" body lift, 3" tank lift, 4.90s, TRE front locker, factory rear locker, Roger Brown Rock Sliderz, 315/75r16 (35") tires, Sport big brakes