I've been thinking of installing a turbo for years, and finally decided to go for it and got a Hahn Stage 1 turbo kit. Most of the instructions they sent are good, and this site has helped a lot.

First off, the kit came with this thing in the fuel system box with no instructions on what to do with it and I have no idea what it is for.


Also the instructions say to T the short hose that goes from the compressor housing to the wastegate line to use as a signal hose for the fuel pressure regulator. Do I just cut the hose and T it? It just seems like a weird place to get a compression signal to me.


Also in the middle of the turbocharger are 4 holes, but from what I've seen in pictures, only the oil inlet and outlet are used. I was just wondering what the other two holes are and is it ok just to leave them open?

Last thing, the kit mentions a metal tube for the return line to the fuel pump, but my kit does not come with one, and it's not mentioned on the item checklist. Do I need one? Or would one of the other fuel lines work just as well?