I had the same code (310B) pop up.
The previous owner deleted the muffler, so today I went ahead and removed the T which M5James mentions in his post. I ordered 4mm HPS black silicon (20feet of it) to replace all the vacuum lines that I can. I noticed that the stock lines that go to the driver side canister is very easy to pull off.
Going to run the car a little more to see if this has resolved the issue. I was thinking it was diverter valves but both look good ..no rips. If it's not the vacuum lines then ill look at this being a wastegate issue.
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