Diesel Exhaust Y Pipe 4.00 inch Diameter to 4.00 Inch Diameter Single to Dual Exhaust WYP400-400 Wesdon Y Pipe Diesel HEAVY 16 GAGE 4.00 DIA SINGLE INLET DUAL 4.00 OUTLETS BY OAL 21.5 INCH LENGTH Y PIPE 9.00 Inches Wide and the Dual Pipes are 5.00 inches On Center 21.50 OAL Add an Y pipe to CREATE dual exhausts Universal Diesel Single to Dual Conversion Y Pipe Aluminized