When I installed my sprint booster, it didn't seem to make any difference...I did the throttle reset and the car came alive...I for one, don't believe a word your mechanic told you...they probably found something, just want to be right...an air intake is just that and the problem would have arose a lot sooner than 4 months...I would drive it and enjoy it, and find a new dealer to do my work...it took my dealership a week to figure a problem out for me, a sensor went bad in the SC...wasn't the pump (yet)...but they at least kept an open mind...some mechanics can be arrogant about those of us that like to do our own work with aftermarket installs, some find them interesting...find one that like the latter...just my opinion...