4-2-1 Stainless Steel Header/Exhaust for 92-96 HONDA PRELUDE 2.3 4CYL H23 BB2 BA8 Piping Diameter: Tri-Y 2 x 1.875" to 1 x 2.000" Gain More performance Due to More Air Flow. Increase Horsepower and Torque, Instantly Gain 10 -15 Hp. / Tq. Made of High Quality T-304 Stainless Steel with Computerized Mandrel-Bends for Strength and Durability Inlet: 1.75",Outlet: 2.00'' 4-2-1, 2 Pieces