Answer: supercharger

AnswerCrossword Clue
SUPERCHARGERSan Diego pro, to the extreme
SUPERCHARGERMall goer, to the extreme
SUPERCHARGERFeature of many a dragster (NFL)
SUPERCHARGERHot-rodder's add-on
superchargera device for increasing the pressure, and hence the power output, in an internal-combustion engine
superchargerA device that increases the pressure of the fuel-air mixture in an internal combustion engine, used in order to achieve greater efficiency