Order pipes from the OPC, claiming club discount and/or Porsche Classic discount if registered. Ask any reputable local garage to replace them and possibly do a brake fluid change too. Only caution is that, like most modern performance cars, the calipers are alloy so care needed slacking off bleed nipples and pipe connections. OPCs are no better at this than good local repair shops.
If a connection breaks or strips out, the caliper can be saved by machining and fitting thread inserts. Mine had Timesert inserts fitted about 9 years ago and no problems since. A recommended local garage replaced ALL my underbody pipes earlier this year with no issues.
