Sigh,
Ok, I have a Corvette with a Big Block with factory Side Pipes, one would say 'so what, so do plenty of folks' while yes, but, mine is a 1973 and there was NO RPO for Side Pipes in 1973, no part number listed, no bulletins no paperwork exist so it should not have happened by the standards given.
But it did, for my neighbor bought the car new, he wanted Side Pipes and he got them, from the factory, I was there when it came off the trailer at the dealership. He owned a Machine Shop and was friends with the Dealership (They built Drag Cars in the 60's) So when he wanted Side Pipes he got Side Pipes.
So the moral of the story is, back then if you wanted something, pretty much you got it. So what if that makes it a 1 of 1 it does not matter. I don't go around beating my chest that I have a million dollar car because of this; but I will say, ain't it cool I am the only one with a 1973 BBC with Factory Side Pipes, Or am I???