No reputable shop does work without prior approval unless they like confrontations. Customers don't like surprises. Who does? If they call to advise of extra recommended work you can say no, defer, or take something else off of the scope.
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'58 356A coupe, just a driver
'00 Boxster S fair weather - daily driver
'11 Jeep Grand Cherokee Limited - winter daily driver
'92 F250 - junk hauler; previous Porsches '95 993;'08 Cayman S;'70 911E
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