Porsche 911 997 Carrera Cabriolet (997.1)

The Porsche 911 Carrera Cabriolet (Type 997, early phase) is the rear-wheel-drive open version of the base Carrera: 3,596 cc, naturally aspirated flat-six, 239 kW / 325 PS and 370 Nm in the factory specification covered here. Porsche Classic groups the early Carrera Coupé and Carrera Cabriolet as 2005-08 cars. The later direct-injection Carrera belongs to the updated Type 997 phase commonly called 997.2.

That distinction matters. A seller describing a car simply as a “997 Cabriolet” has not told you whether it is a Carrera, Carrera S, Carrera 4 or Carrera 4S, nor whether it is an early or updated car. Those differences change the engine, driven wheels, suspension specification, gearbox choices and the ownership questions worth asking.

Porsche 997.1 Carrera Cabriolet specifications

Porsche's own historical material supplies a useful core specification, while a current Porsche-network legacy listing exposes additional factory data for the manual rear-drive derivative.

The performance and weight rows are deliberately labelled manual. Porsche also offered Tiptronic S in this period, so it would be misleading to flatten one set of manual-car figures into a gearbox-neutral specification.

Porsche Classic lists Porsche Active Suspension Management (PASM) as an extra-cost option on the base Carrera, along with the extendable aerodynamic rear spoiler and the period PCM system. That is useful when comparing cars because PASM being present on one Carrera Cabriolet does not make it standard equipment across every base car.

What does 997.1 actually mean?

997 is Porsche's Type designation. 997.1 and 997.2 are useful enthusiast and trade shorthand for the early and updated phases, not two separate Porsche Type numbers.

Porsche's history gives the meaningful mechanical boundary. The early Carrera used the 3.6-litre engine at 325 PS; the early Carrera S used a 3.8 at 355 PS. The model update introduced in 2008 brought direct fuel injection and the option of Porsche Doppelkupplung (PDK). The updated 3.6 Carrera rose to 345 PS and the 3.8 Carrera S to 385 PS. Porsche Classic groups those updated Carrera Coupé/Cabriolet cars as 2009-12.

For a car close to the changeover, the first-registration year is therefore a clue rather than the final answer. Build data, VIN-linked specification, the actual engine and the gearbox fitted are better evidence.

Carrera Cabriolet vs Carrera S Cabriolet

The simplest distinction is also one of the most frequently blurred in adverts:

• Carrera Cabriolet: 3.6 litres, 325 PS in the early phase.
• Carrera S Cabriolet: 3.8 litres, 355 PS in the early phase.

Porsche also lists PASM as optional on the base Carrera but part of the S model's standard chassis specification. The S received its own brake and wheel specification as well. An S therefore should not be described as a base Carrera with a little more power, and an ordinary Carrera should not inherit the S model's equipment by assumption.

The same applies to the number 4 in Carrera 4 and 4S. Those are all-wheel-drive derivatives. The base Carrera Cabriolet on this page is rear-wheel drive.

Manual or Tiptronic S: verify the car, not the phase label

TMJC's 2006 example is a six-speed manual, and Porsche's legacy specification for a manual early Carrera Cabriolet gives the 5.2-second 0-100 km/h time and 285 km/h top speed shown above. Porsche's own legacy performance data also distinguishes manual and Tiptronic values, confirming that an early Carrera Cabriolet should not be reduced to “997.1 equals manual”.

On a manual car, clutch and dual-mass-flywheel history can be useful evidence of how the car has been maintained. On an automatic, the questions change. Either way, the gearbox should agree with the build information and invoices rather than with a generic online specification copied from another car.

IMS on a 997.1: why “IMS done” is not enough

The intermediate-shaft bearing is one of the most repeated subjects around early water-cooled 911s, but the phrase “IMS done” can hide more than it explains.

LN Engineering's specialist technical guide says model-year 2006-on 997/987 engines used a larger, non-serviceable IMS bearing that cannot simply be replaced through the familiar retrofit procedure without engine disassembly. It also notes that a Porsche replacement engine may contain the bearing design current when that replacement engine was built.

RPM Specialist Cars goes further for the base 3.6, publishing an M96/05 engine-number breakpoint between the earlier smaller bearing and the revised larger design. That is useful specialist identification guidance, but it is not being treated here as a Porsche factory specification.

The practical conclusion is straightforward: ask for the engine number and the invoice. If a seller says a 2006-08 car had its “IMS changed with the clutch”, the paperwork should explain precisely what work was performed. Do not assume the phrase means the same procedure on every 997.

This is also why registration date should not be used as a substitute for engine identity. A late-registered earlier-build car, an engine replaced under warranty or a later replacement unit can break a simple calendar-year rule.

Bore scoring: evidence is more useful than reputation

Cylinder-bore scoring is a separate question from the IMS bearing. The two should not be bundled into one vague “engine issues” label.

Specialist sources including Hartech treat scored cylinders as a real repair category on the M96/M97-era water-cooled engines, while contemporary used-car guidance commonly associates the problem more strongly with the 3.8-litre Carrera S. That does not justify describing every 3.6 as immune or assigning a failure probability to an individual car from its badge.

A useful pre-purchase investigation starts with the actual engine. Service history, oil-use evidence, cold and hot running, exhaust behaviour and diagnostic information can all form part of a specialist inspection. If a borescope is appropriate, ask what was inspected and whether the report covers all six cylinders, ideally with dated images or a written finding.

The distinction between “a borescope was mentioned in the advert” and “there is a specialist report showing the condition at a known date” is important. Neither is a lifetime guarantee, but the latter is real evidence.

A good PPI should look beyond the engine

The internet discussion around 997.1 Carreras can become so engine-focused that the rest of a roughly 20-year-old sports car receives too little attention.

A specialist pre-purchase inspection should reconcile the car with its paperwork, then assess the whole vehicle. On a Carrera Cabriolet that includes:

• operating the roof through a complete open-and-close cycle and checking that the movement, latching and window operation are consistent;
• inspecting hood material, seals and the cabin for signs of water ingress or previous adjustment;
• checking tyres as a matched set for age, condition and wear pattern rather than tread depth alone;
• assessing brakes, dampers, suspension joints and alignment together;
• checking the front cooling area and underside for debris, damage, leaks and ageing components;
• confirming that PASM, Sport Chrono, PCM, seat functions and other fitted equipment actually operate if the car has them;
• comparing paint and panel condition with the history file rather than assuming a clean exterior proves an untouched shell.

PASM deserves particular care in adverts. Porsche Classic lists it as an option on the base Carrera. If fitted, it is part of that particular car's specification; if absent, that is not evidence that the car is incomplete.

TMJC example: LB06KXL

A surviving historical advert connected to The Matt Johnston Collection records LB06KXL as a 2006 right-hand-drive Carrera Convertible with 3,596 cc, six-speed manual transmission and 52,041 miles at the time of sale. The seller record says Porsche Centre Chiswick supplied the car in June 2006.

Its most useful detail is not the option list. The advert says a specialist carried out a full borescope inspection of all six cylinders, finding no scoring and visible cross-hatch at that point. It also records June 2025 work including the clutch and dual-mass flywheel, clutch release/slave components, water pump, drive belt, plugs, filters, fluids and routine service items.

That makes LB06KXL a good illustration of how to read a used 997 advert. A buyer can ask to see the borescope paper trail and the invoices behind the maintenance claims. Those documents say much more about the individual car than a sentence claiming that the 3.6 is inherently safe.

The same restraint works the other way: a clear borescope at one date does not prove that a cylinder can never develop wear later. It records condition at the time of inspection.

Questions worth asking before buying

Where this car sits in the 997 family

The Porsche 911 Type 997 guide covers the full generation, including the 997.1/997.2 transition, Carrera S, Targa, Turbo and GT derivatives. The Porsche 911 model guide places the 997 in the wider 911 lineage.

For the exact early base Cabriolet, the useful summary is simpler: 3.6-litre naturally aspirated flat-six, 325 PS, rear-wheel drive, Cabriolet body, with the individual gearbox, options, engine identity and condition verified from the car's own documentation.

Sources and further reading

• Porsche Classic — Porsche 911 Carrera (type 997): https://www.porsche.com/australia/accessoriesandservice/classic/models/997/997/
• Porsche Zentrum Limburg / Porsche AG — 911 Carrera Cabriolet (997 I) technical data: https://limburg.porsche.de/de/inventory/porsche/porsche-911-carrera-cabriolet-gebraucht-R9OWWL
• Porsche Newsroom — The 997: Technology offensive, new design and great variety for the 911: https://newsroom.porsche.com/en/history/porsche-911-seven-generations-part-6-type-997-16489.html
• Porsche Newsroom — Sixth generation, engines: https://newsroom.porsche.com/en/press-kits/60-Years-Porsche-911/6.-Generation---Motoren.html
• The Matt Johnston Collection via Car & Classic — historical LB06KXL advert: https://www.carandclassic.com/car/C1957328
• LN Engineering — Porsche IMS Bearings guide and FAQ: https://lnengineering.com/products/the-definitive-guide-and-faq-for-porsche-ims-bearings/
• RPM Specialist Cars — IMS bearing replacement guide: https://www.rpmspecialistcars.co.uk/service/ims-bearing-replacement/
• Hartech Automotive — common Porsche engine faults: https://www.hartech.org/porsche-engine-rebuilds/common-faults