Porsche 911 GT2 RS Intercooler: CSF Twin Set Review

The CSF Porsche 911 GT2 RS Twin Intercooler is a direct-fit performance intercooler set designed to keep the most extreme 991-generation 911 making power when the track heats up. The 2018-2019 GT2 RS is a 700-horsepower, twin-turbocharged 3.8L flat-six that set a 6:47 lap of the Nurburgring Nordschleife at its 2017 debut – the fastest road-legal car around the circuit at the time. That kind of sustained output generates enormous heat, and on repeat hot laps the factory intercoolers heat-soak and intake air temperatures climb. In our Tampa, FL shop we see the same story on every forced-induction track car: the first lap is glorious, and by lap four the power tapers. The CSF Twin Intercooler Set is built to erase that fade.

Why the 991 GT2 RS Runs Hot

The GT2 RS runs hot because it combines a heavily boosted engine with hard, sustained track use. Its 3.8L twin-turbo flat-six produces 700 hp at 7,000 rpm and 553 lb-ft of torque, launches to 60 mph in about 2.7 seconds, and tops out at 211 mph. Every one of those horsepower figures depends on the intercoolers pulling heat out of the compressed intake charge before it reaches the cylinders. When the intercooler core saturates with heat – heat soak – intake air temperatures rise, the ECU pulls timing to protect the engine, and power drops.

On a roughly 3,241-lb rear-drive car with around 1,000 examples ever built, owners are not modifying for bragging rights; they are protecting a rare, track-focused machine so it performs on lap ten the way it does on lap one. Cooling is the highest-value upgrade on the GT2 RS precisely because the engine is already built and boosted from the factory – the job is to feed it consistently cool air, not to chase more peak horsepower.

This is a well-understood pattern on modern turbocharged Porsches. The 991.2 platform shares its cooling architecture across the Turbo, GT3, and GT2 RS, and the more aggressively you drive, the more the factory intercoolers and radiators become the ceiling on sustained performance. Ambient temperature makes it worse: a summer track day in Florida punishes charge-air cooling far harder than a cool European test session, which is why the same GT2 RS that feels bulletproof on a data sheet can quietly lose its edge in real heat. Addressing intake temperature is the single most repeatable way to protect lap times, and it is the reason CSF built a dedicated intercooler for this car rather than a one-size-fits-all universal core.

CSF GT2 RS Twin Intercooler: What It Is

The CSF GT2 RS Twin Intercooler Set is a pair of upgraded, all-aluminum intercoolers – one per turbocharger – engineered by CSF in partnership with PWR, a supplier to Formula 1 and top-tier motorsport teams. The headline feature is CSF's rolled-tube core. Where the OEM intercooler uses a flat-face tube that scatters airflow when it hits the tube face, CSF's rounded tube edge lets air travel around the face and into the core, maximizing airflow and heat dissipation.

CSF is not a newcomer to this problem. The company has spent decades supplying OEM and motorsport cooling, and the GT2 RS set carries the "CSF by PWR" designation, tapping PWR's Formula 1 and endurance-racing radiator expertise. Both intercoolers are constructed from aircraft-grade aluminum around the rolled-tube core, and the set is matched so both turbochargers see identical cooling. Because the design mirrors the factory dimensions, there is no need to relocate charge piping or trim bodywork – the upgrade is contained entirely within the OEM footprint, which is exactly why it appeals to owners who want more capability without a permanent, hard-to-reverse modification to a collectible car.

How It Performs vs the OEM Intercooler

Against the factory units, the CSF set is designed to hold intake air temperatures lower and more consistently under sustained load, which translates to more repeatable power. CSF built the cores to the same 87mm thickness and 103mm-wide side-channel end plates as the OEM intercoolers, so the upgrade drops into the stock location with no fabrication – the gains come from the core design and the increased cooling capacity, not from a larger, harder-to-fit box. For a boosted engine, cooler and denser intake air means the ECU is less likely to pull timing, so the GT2 RS holds its output deeper into a session.

CSF and PWR report that the upgraded cores deliver noticeably lower charge-air temperatures and reduced heat soak compared with the factory intercoolers on repeat runs. In real-world terms, that is the difference between a car that defends its lap times over a full track session and one that quietly detunes itself as the mercury climbs. It is the classic case for a cooling upgrade: you are not adding peak power, you are keeping the power you already paid for.

Installing the CSF Intercooler on a GT2 RS

Installation is a genuine bolt-in job because the CSF cores share the OEM 87mm thickness and 103mm end-plate width, so the factory charge piping, brackets, and shrouding all reconnect in their original positions. There is no cutting, no custom fabrication, and no tune required for the intercoolers themselves – the ECU simply sees cooler, denser air. In practice, the labor is in careful disassembly of the GT2 RS's rear bumper and cooling ducting to access the intercoolers, then reversing the process. For a car of this value we always recommend professional installation, and our Tampa shop can handle the fitment or advise your local Porsche specialist on the process.

One practical note: because the GT2 RS is PDK-only and rear-drive, the entire cooling system works hard to manage engine, transmission, and charge-air heat simultaneously. That is why owners who track the car frequently pair the intercoolers with upgraded radiators rather than treating cooling as a single-component fix – the heat has to leave the car, not just move from one exchanger to another.

Complete the GT2 RS Cooling System

The intercoolers are the headline upgrade, but the 991 GT2 RS relies on a network of heat exchangers to stay in its window. CSF, which has manufactured radiators for over five decades, offers matching all-aluminum side radiators and a center radiator that share the same fitment. Adding them alongside the twin intercooler set builds a complete, track-ready cooling package. Here is how the CSF GT2 RS cooling upgrades – plus a companion brake option – compare.

GT2 RS Braking: GiroDisc PCCB Rotors

Cooling keeps the engine honest; braking keeps you on track. For GT2 RS owners running the optional Porsche Ceramic Composite Brakes (PCCB), GiroDisc offers a two-piece iron-rotor conversion in the PCCB pad shape – a far more affordable way to replace worn ceramic discs with a slotted, serviceable iron rotor. At $1,725.75 for the front pair, it is the sensible companion upgrade for a car that will actually see lapping days, saving thousands over OEM ceramic replacement while adding fade-resistant slotted rotors.

Is the CSF Intercooler Worth It on a GT2 RS?

For any GT2 RS that turns laps, yes. The engine is already making 700 hp; the limiting factor on track is keeping intake temperatures in check so the ECU does not pull timing. A plug-and-play cooling upgrade that preserves that power over a full session is the definition of a high-value modification on a car of this caliber. If the GT2 RS lives a pampered, low-mileage life, the factory cooling is adequate – but the moment it sees a hot track day, the CSF Twin Intercooler earns its keep. Our team in Tampa can help you spec the full cooling package to match how you actually drive.