AFTERMARKET NOS PARTS FROM WALDRON'S EXHAUST; These are components that we have acquired over the years. The parts were manufactured by Walker, Maremont, International Parts Corp (IPC), Arvin or other exhaust component manufacturers as service replacement parts for OEM components. They will be cleaned to remove any surface corrosion and coated with a corrosion-resistant coating unless you ask us to leave them untreated. This Y pipe fits 1971-73 Ford Mustang / Mercury Cougar with 351ci engine. This part will generally ship within 1 wk.