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Lets not start that thread again, CAI does not work well with Crawford Plenum because CAI adds more turbulance in the air comming into plenum this along with CAI has shown to decrease as much as 10whp with Crawford.As far as plenum spacers and other Plenums no idea.
He hit the nail on the head^^^ It was me that picked up 10whp SAE corrected with a Pop-charger and Crawford plenum over the Crawford and AEM(basically Nismo) intake on the same dyno. The shop owner where I dyno'd told me to try it I did and it worked. If you want more info look up my old thread. If you dont believe me, then let my track times with minimal mods speak for themselves, you wanna believe the guy with dyno and track times to back it up or just the guys who assume all is well? Up to you guys....btw Im not the only one to experience these gains switchign from CAI to short ram.