16V Short runner intake manifold for Turbo or 16VG60 conversion. -Quicker boost spool up. -More HP and torque -Cooler air intake The small ports have following threads: ½ NPT and ½ 20 UNF Manufacturer Information about the manufacturer BAR-TEK BAR-TEK Motorsport GmbH Im Rauschen Auel 3, 51491 Overath-Brombach, Germany info@bar-tek.com