The correct Ford muffler assemblies for your '70 convertible are Ford part numbers D0ZZ-5230-B and D0ZZ-5230-D. Both left and right muffler assemblies come with the inlet pipes and tailpipes welded to the muffler as an assembly. The tailpipes turned down and did not have the chrome tips. The mufflers and tailpipes were aluminized steel, while the inlet pipe was regular exhaust pipe and not aluminized.
The '70 Mach 1 with the 351C engine used muffler assemblies D0ZZ-5230-C and D0ZZ-5230-J, which were the same as the D0ZZ-5230-B and D assemblies with the exception of the tailpipes and engineering numbers on the mufflers that identified the two systems. The Mach 1 tailpipes were cut short with locating tabs for the chrome exhaust tips. According to the 1970 Ford Facts Book and the 1970 edition of the Ford Parts and Accessories Manual, the chrome tips were factory installed only on the Mach 1s.
Shelby Parts and Restoration in Green Bay, Wisconsin, offers a good reproduction of the '70 Mustang exhaust systems for all applications. Contact Jim Cowles at 920/434-3645.
Send restoration questions to: Resto Roundup, c/o Bob Perkins, Perkins Restoration, North 3123, Highway 16 & 26, Juneau, WI 53039. Send e-mail to: mustang.monthly@primedia.com.