Once air enters your intake system, it needs to be mixed with liquid fuel in order to burn efficiently and cleanly. Back in the days of woolly mammoths and saber toothed tigers, when people lived in caves, the carburetor did this job by forcing liquid fuel through tiny jets, creating a mist by mixing it with incoming air. Like a stone axe, it did the job, but not very efficiently. Today's fuel injectors are far superior to old-time carburetors, but even their performance can be improved by the BBK Throttle Body Spacer. By lengthening the intake tube, the incoming air gets "swirled" around considerably before meeting up with the fuel. This results in a finer, more mist-like mixture - which in turn, leads to better burning inside the cylinder, creating greater horsepower - especially in the low to mid-range - as well as reduced fuel consumption. BBK products have drawn high praise from the industry, and have been written about extensively in publications such as Fast Fords and Hot Rodder. The BBK Throttle Body Spacer is designed using CAD software, and uses CNC machining in its manufacture. When it comes to quality and dependability in performance parts and accessories, think BBK. Shoppers want high quality information and support while considering reliable parts for their car or truck. For our valued customers, we've established an always-open customer assistance bureau to assist you with your questions. Everybody hates to pay for shipping, that's why we offer completely free shipping for each order $50 and higher. If you spot a lower price elsewhere, let us know - we always beat any price advertised elsewhere.