Spectre Universal Tube Y-Pipe 4in. OD / 180 Degree Y-Angle / 90 Degree Leg Angle (6in. Legs)Spectre's 4 inch outside diameter Y Pipe is designed for custom 2 into 1 style air intake systems utilizing 4 inch tubing. This Y pipe has legs that come out of throttle body at a 90 degree angle to the right and left of the engine (leg angle), and 180 degrees of separation between the two 6 inch long legs (Y pipe angle). Available with a polished aluminum finish, this tube can be welded or connected together to fabricate a dual inlet intake system