Windage Tray, Steel, GM LS Louvered to Fit Moroso Rear Sump Oil Pans with GM Main Cap boltsFits: 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. 20139, 20140, 20141, 20142, 20143, 20145, 20147, 20148, 20149, 20150, 21150, 21152, 21153, 21157 and 21158 • Must use Corvette C-6 Dipstick and tube Part Nos. 12570788 & 12570787