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Here's our selection of Wilson spacers. Three varieties: open (for increased plenum volume and power in the midrange), tapered four-hole (for better air/fuel distribution to each intake runner-best in single plane applications), and untapered four-hole (for low-end response and increased throttle response by increasing venturi signal). Wilson spacers are CNC-machined from billet aluminum. When hood clearance isn't an issue, 1.25-, 1.5-, 1.75-, and 2-inch varieties are available as well.