You can remove the heads without removing the engine but it is very difficult to reinstall & you must buy special tools to set the camshaft timing.
I recommend you get this drill fixture made for the exhaust stud removal: BOXSTER/996/997 EXHAUST BOLT REPAIR KIT
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OE engine rebuilt,3.6 litre LN Engineering billet sleeves,triple row IMSB,LN rods. Deep sump oil pan with DT40 oil.
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