Hey, where did you get that image from?

First time I see it!

That photo is thrown around a lot in the Spacex fan community. At least it was. I think the photo is at least two years old.

I suspect that many of those pipes are for testing instrumentation of the early models. And those that remain necessary, might be built into channels in the engine body now, like how a carburettor is built. That's much simpler and cheaper to manufacture and maintain, not to mention more reliable.