On a scale of 1-10: DIY PITA rating on replacing waste-gate lines.
#3
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The difficult part is, once you access the line, removing the factory fitting on the end of the hardline. It is MUCH easier to run a new line from the N75 "Y" straight to the wastegate actuator. Get some good quality line and route it wisely (away from hot components).
The next time your motor comes out, you can replace those temporary solutions.
The next time your motor comes out, you can replace those temporary solutions.