That looks like literally 2 90* bends welded and a bung? for a sensor or something… Correct me if I’m wrong on that? If it was a little more complex okay sure…
you had an overpriced piece of piping with a brand name on it… Good for you, glad you made some profit off of it. Not everyone is that naive
considering its probably half that in parts, I wouldn’t fab an intake like that for someone for less than that price (parts/labor). seems like a good deal to me. If you know how to weld you could do it up for cheaper, but that’s if you can weld.
labor (95/hr) so billed is probably .8-1.0 for fitting, welding, etc.
100$ is fair. now if you could TIG weld aluminum then make it yourself, realistically though. how many people could do it themselves? less than an handful of people on here i bet.