Hey there CS!
Been wondering where you went.

I'd take it to Enrique and ask him what iit will need to pass.
It's a good bet to do a tune up, new wires if you haven't done that, new Distributor cap, and Rotor, New spark plugs, new air filter. and oil change and filter.
Have Enrique put it on the CO machine and fine tune it. I believe that he has a smog shop that he uses. Might be worth the cost to have him tune it and take it to the smog shop.

I don't remember what all you did to it when you got the car.

I have an idea that the Metal tube was an attempt to pipe in air to the air filter, but I do not know. If it isn't connected to anything elase under the car, then I suspect that is what it was. ???

I just went through all that to get The Blue Bird Smogged and titled.

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1986 Euro 500SEC "RUF" 9:1CR, "Rose"
1985 Euro 500SEC Cabriolet AMG Widebody
1982 Euro 500SEL "Blue"
2001 Texas Heeler (Aussie/Queensland X) "Sulphie",
2012 Queensland Red Heeler "Squeak"
Best dogs I've ever had.