Been having a measure between the 2wd & 4x4 plenum today the 4x4 plenum is approximately 10mm deeper and granted the elbow is larger with smoother radiuses, but I would of thought they would of designed the slot a lot bigger where it enters the plenum as it is only 3mm wider and the same length, so this is still the restrictive point!

Just curious has anyone dyno’d before and after fitting the 4x4 plenum if so what were the gains?