Moroso 22941 Moroso GM LS Louvered Windage TrayMoroso 22941 Moroso GM LS Louvered Windage Tray Louvered Windage Tray, LS Engine Also a replacement part for Moroso No. 21150 Fits: GM LS Engines with GM Main Cap Studs & Moroso Rear Sump Oil Pans Louvered design allows oil thrown from rotating assembly to drain into sump without splashing back, reducing windage, increasing power and cutting down oil temperature Manufactured from 16 gauge steel Mounts right to the main caps Fits Moroso Oil Pan Nos.