Our 4150 Intake Elbow was designed with the intent to maintain good air distribution while remaining somewhat short at just under 6.25" overall height. The 1" thick billet aluminum base flange with 3D transitional geometry combined with a roll formed air vane greatly improve airflow to the front side of the engine compared to other elbows available on the market. The billet aluminum throttle body flange has a 105mm opening and has Ford and LS bolt patterns. The backside of the elbow has (2) 1/4" NPT and (1) 3/8" NPT Vvcuum ports. 5/16"-18 alloy steel mounting bolts are included.