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Hello, my name is Bobby. Thanks for the question. Is it still making the same noise or is it just losing power?
Leaving the pipe off would not damage the turbo if you did not drive it long. Is the check engine light on? If it is then you need to clear the codes and see if it will drive better. It may be in limp mode. Also make sure that none of the wiring near where the hose was off were damaged from the heat.
You can try disconnecting the battery and hooking it back up. The only right way to do it is with a computer scan tool that you can get at most auto parts stores.
That can definitely affect it. If you can get the codes it may reveal that you have a control circuit issue also. What kind of plugs did you use?
The computer will try and compensate for the boost being low. Resetting everything may solve it.
When that happens usually it is pretty straight forward. If nothing else was damaged outside of the tube then it should be fine once you reset the system. I am concerned about those wires though. If they are covered then they should be fine, but the connection terminals may not be connecting too good either.
You need to make sure that none of the hoses are disconnected as it will cause the pressure reading to be off. Let me know what happens when you do this and we can continue if needed.
Any time. If I can think of anything else to check off of the top of my head in the meantime then I will send it over.