Performance Air Intake For Nissan 240SX S13 Silvia (1991-1994) 2.4L L4 Engine BlackSharpen Throttle Response and Induction Flow for Your S13 KA24DE Who Its For: Designed specifically for Nissan 240SX S13 and Silvia owners running the legendary 2. 4L KA24DE engine family who want to bridge the gap between street reliability and track ready air management. The Problem: The factory airbox on the KA24DE is a massive, restrictive plastic assembly designed more for noise suppression than actual velocity. Over thirty years of heat cycles