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I'm doing exactly what you are asking about with a 2003 S (3.2 liter). The car belonged to a coworker. At a stop sign the engine started sound like rocks in a can so the previous owner turned it off. Then re-started it and drove home. There was plenty of metal in the oil filter. The IMS bearing and shaft were both toast. So here is was the damage:
The oil filter did its job and kept the metal upstream of the delicate workings. There was plenty of shrapnel in the oil pan, imbedded in the timing chain guides, and pretty much throughout the lower part of the engine. The valves did not meet the pistons, so there was no upper end damage.
So the cost due to the failure - $1500 for a new shaft and bearing, $250 for seals, $200 in various tools and cleaning solvents. $10 at the local electronics parts outlet for rare earth magnets to pull the chips off the aluminum (works great). Plus various manuals.
But as the engine has 120K miles, new bearing set Rods and Mains $225,(and did it need it!) new rings, about $200-$300 for a custom ground set, about $1200 for Porsche. Head work about $800 without new valves. new air oil separator (AOS) about $100.
Expect to pull every nut and bolt apart on the engine because that's what replacing a failed IMS (bearing and shaft) entails. The bearing tends to redesign the shaft during the failure.
Porsche parts are hyper expensive. If the valves had hit the pistons I'd have gone for a 911 motor - easy to do, but replace the IMS bearing first thing with an improved bearing if you go that route.
So all told - broken car $3800, IMS parts and supplies about 2k, about 1.5 k for the mileage so a little under $7500.
New 911 motors go from $7500 to $10K depending on what you get and how proud of it the owner is.
Jim
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