The Crane Quick Flow Power Spacers have shown gains of up to 22 HP and 4 MPG over stock. The Quick Flow increases airflow efficiency for fuel injection or carburetors vehicles. It also increases power and performance from idle to max RPM. Computer designed for maximum airflow and tested and proven on chassis dynamometer for proven results. This easy to install spacer bolts onto stock intake manifold. and delivers excellent ''Horsepower-per-dollar'' performance. Quiet operation, no excessive ''intake noise''. CNC machined from T-6061 aircraft grade billet aluminum, this unique, patented design creates controlled, dynamic turbulence that improves fuel atomization and aids cylinder filling. Fifty states emissions legal (CARB No. D516-2). Comes ready-to-install with all hardware and gaskets.