When used with {HEAD ~ an air intake pipe} for an internal combustion engine, {TAIL ~ the device} allows more horsepower and mileage to be extracted from the engine 
When used with { HEAD ~ an air intake pipe } for an internal combustion engine , { TAIL ~ the device } allows more horsepower and mileage to be extracted from the engine
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH