Porsche GT2 RS
The M97.70S of the 997 GT2 is the Mezger at the peak of turbo development: 390 kW standard, boosted to 456 kW in the GT2 RS with an aggressive turbo setup. The GT2 RS verdict: "encouragingly unhinged", brutal, demanding, not for everyone on the road. The turbo thrust comes massively and demands concentration — no AWD, with a rear axle that must manage maximum torque. Sound: turbo-dominant, less smoky than a naturally aspirated engine, but with the Mezger base character. Reliability: top, as long as the engine isn't abused by extreme tuning. The 997 GT2 RS is a "too much for the street" car — fascinating, intimidating, and an absolute rarity that wants to be treated accordingly.
Legalised insanity — professionals only
The 997 GT2 RS with 456 kW is the most extreme thing Porsche put on the road in the 997 era — "encouragingly unhinged" and "legalised insanity" (press quotes). The verdict: "too much for the street" for most drivers. No all-wheel drive, maximum boost, no compromise. The car is a rarity and values have exploded accordingly. An experience beyond any normal sports car — for everyone else there is the GT3 RS.
Engine Weaknesses 6
Plastic coolant pipes at the oil cooler connection become brittle and crack at the O-ring seat. Engine removal is required for repair. Aftermarket steel retrofit kits recommended.
Symptoms: Sudden coolant loss, steam from engine bay, overheating warning
Variable turbine geometry (VTG) linkage corrodes and seizes. Boost pressure is no longer regulated correctly. Common on low-mileage or rarely-driven cars.
Symptoms: Fluctuating boost pressure, power loss, check engine light
Hydraulic engine mounts lose their damping fluid over time and collapse. Engine rocks under load changes. Particularly noticeable from 150,000 km onward.
Symptoms: Dull thud on take-off, vibrations at idle, play in the drivetrain
Exhaust manifolds crack at weld seams due to thermal cycling. Because the catalytic converter is integrated in the mid-engine layout, replacement usually requires a new cat as well.
Symptoms: Ticking noise when engine is warm, exhaust smell in cabin, black soot marks
Knock sensors fail due to housing cracks or wiring corrosion. Sensor is poorly accessible, located behind the air filter and A/C compressor.
Symptoms: Check engine light, fault codes P0327 or P0332, engine runs normally without power loss
Camshaft variable valve timing solenoid fails. Fault P0018 (cam phasing) appears on cold start and clears once the engine is warm.
Symptoms: Engine warning on cold start, P0018, slightly rough initial idle
Vehicle Weaknesses 7
Damper piston rods corrode due to stone damage and moisture. Relevant for roadworthiness testing, as damper function is compromised.
Drain channels around the windscreen and luggage area clog with leaves and dirt. Water runs into the interior.
On 997 models from 2004–2008 the exhaust tailpipe can detach due to inadequate weld quality. Recall with free repair.
The 997 without underbody covers is susceptible to salt corrosion. Suspension components, springs, exhaust brackets and coolant hoses rust.
Both AC condensers become leaky through stone damage and corrosion after 12–15 years. Refrigerant loss leads to complete AC failure.
High-pressure hoses and steering rack seals become leaky after 10+ years. Hoses should be replaced preventively.
After a battery failure or replacement, the 997 loses the configuration that seat heating is installed. Recoding via diagnostics resolves the issue.
Reports & Tests
50 owner complaints filed with NHTSA (2004–2012). Most reported: Engine (41), Engine & Cooling (6), Wheels (2).