Your ECU looks for that air between shifts it will almost certainly bog down or backfire when u lift off the throttle when i had mine to the atm. just for troubleshooting it ran like a dogs a$$. definatly wouldnt reccommend that!! unless you run some kind of AFC to change the parameters during shift point...even then it takes alot to get right with out aftermarket EMS or MAFT PRO.. or in other words.. $$$$$$$$$$
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