I have an update to this thread. One of my concerns with headers was how easy can you change the starter and alternator. I carry a spare of both on trips because nobody stocks them. (Auto parts stores)

The alternator is easy to change, even without jacking up the car. Today, I confirmed I can change the starter with the small tool box I carry in the car. It does require jacking up the car and you definitely need to wait for the exhaust to cool.