I have'nt changed anything yet ,i'm just looking to see what is out there. My 1980 still has the original exaust system on it, only 14,860 miles one owner. I'm going to true duals for sure before spring, no headers for now.Emission laws are tough here in Pa. even with classic plates. You are still required to run a cat, and my FORMER inspection guy looks under the car instead of the other way. I can't blame him, he could be fined thousands of dollars and lose his inspection license and be out of business. Did you order stainless or aluminized. I think I'm going stainless with Magnaflow stainless mufflers.