Aluminium Dual Intake Plenum - Low Profile (Polished)Spectre's low profile, dual inlet plenum is designed to provide an option that allows you to run two air intake tubes. By running two tubes instead of one, you can increase your air flow even more over a single air intake tube setup. In addition, by routing the air filters away from heat sources like the headers, your engine can get cooler air flow and better performance. Polished aluminum finish Dual inlet design Designed for 4 inch diameter intake