Fits GM LS Engine Swaps;Block hugging design provides excellent clearance for LS engine swap applications; Cast iron design is durable and provides excellent sealing; Ceramic coated for heat tolerance, lower underhood temperatures, good looks and performance; Offers ability for maximum ground clearance; 2-1/4 inch outlet and healthy port contours for good performance from a cast manifold; Includes 2-bolt 304 stainless steel flanges to assist in fabrication of down pipe connections; Works with stock GM gaskets, studs and nuts for a factory appearance and easy of servicing;