2005 911 Carrera Coupe 6-Speed Modified

There are a handful of reasons a 997 engine can fail. First, there’s the infamous IMS bearing—a single-row bearing that supports the engine’s intermediate shaft. When this bearing flakes or pits, the IMS shaft can shift, scoring the crankcase and leading to engine failure. Then there’s bore scoring, caused by debris trapped in the cylinder barrel, which leads to uneven cooling and bore distortion. So what do you do when this happens? You make lemonade out of lemons—and add some extra horsepower while you’re at it.

That’s exactly what the owner of this 2005 911 Carrera Coupe 6-Speed did after experiencing such a failure. Following an “engine goes pop” moment at 75,000 miles, the owner had the original 3.6-liter flat-six removed and rebuilt to 4.0-liter Stage 2 specifications by Jake Raby at Flat 6 Innovations, using their LN Engineering Nickies big bore kit. Now showing 80,323 miles on the odometer, this Seal Grey Metallic over Black 997 appears to be in nice condition and comes with full documentation of the build, which totaled over $40,000.

Since this 997 has been modified, it’s a bit tricky to pin down a value, as there aren’t many comps for punched-out 3.6s. Over the past twelve months, average prices have hovered around $43,400, with typical mileage between 45,000 and 55,000 miles. While this example had higher-than-average mileage, it also came with above-average power from a highly reputable engine builder. It sold at a final bid of $44,500—slightly above average, and right in line with its lower estimate.

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