Trusted Brands. Battle-Tested Parts. Built for Heat.
Whether you're daily driving the project car or chasing lap times, heat's the one thing that'll always try to get in the way. And once temps start climbing, everything else — power, reliability, even drivability — goes with it.
That's why your cooling system matters more than most people think. Radiators, hoses, expansion tanks, thermostats — they’re not glamorous, but they do the hard work. Keep coolant moving. Keep the engine stable. Keep you out of trouble.
It doesn’t need to be fancy. It just needs to work. And work every time.
In this guide, we’ve rounded up some of the most trusted brands in the business — and the gear they make to keep your temps under control.
Why Cooling Systems Matter
It’s easy to focus on horsepower numbers and forget that heat is your engine’s quiet killer. Every combustion cycle, every hot day in traffic, and every spirited drive generates heat that needs to be managed, fast and efficiently.
That’s where your cooling system steps in. Radiators dissipate heat from coolant. Oil coolers protect the lifeblood of your motor. And expansion tanks and high-temp hoses ensure every part of the system can handle the pressure.
Upgrading your cooling system means more consistent performance, less heat soak, and more confidence behind the wheel. It’s not vital just for insane turbo builds or track day warriors. It’s for anyone who wants their car to run as hard and as reliably as it possibly can..
CSF Racing
CSF Racing 1-Row 31mm Ultra High-Performance Radiator – Universal (Part #7094)
Slim fit, big flow.
Don’t let the single row fool you — this 31mm aluminium core is engineered for high efficiency in tight spaces. Ideal for street cars or lightly modded builds that still need serious cooling capacity.
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CSF Aluminium Radiator Filler Neck w/ 1.4 Bar Cap – BRZ / 86 / GR86
Small upgrade, major protection.
Pair this CNC-machined billet filler neck with any high-performance radiator to increase cooling system pressure capacity. Includes a 1.4 bar CSF cap for added boil-over resistance.
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CSF 2-Row 42mm Race-Spec Radiator – Audi A3/S3 8V, TT 8S, Golf GTI/R Mk7
MQB cooling done right.
This all-aluminium drop-in upgrade is a must for tuned or track-prepped MQB-platform cars. The 42mm dual-pass core offers superior heat dissipation without adding bulk or compromising airflow.
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CSF 2-Row 42mm Race-Spec Radiator – Subaru Forester XT SG
Cool that boosted boxer.
Built specifically for the turbocharged SG-chassis Forester, this all-aluminium core keeps things cool even when boost and outside temps rise. An ideal companion for heavy loads or aggressive driving.
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CSF 2-Row 42mm Race-Spec Radiator – Honda Civic Type R FK8 (2017–2021)
Stay chill, even when VTEC kicks in.
Perfect for FK8s running hard on track or with high-output tunes. This drop-in unit improves thermal stability and keeps engine temps consistent during high RPM, high heat sessions.
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PSR
PSR Silicone Radiator Hose Kit – WRX (2008–2014), STI (2008–2021), Forester XT (2008–2013), Liberty GT (2007–2009)
Bulletproof cooling for high-mileage heroes.
This multi-fit kit covers Subaru's most popular turbo platforms. If you're pushing boost or just tired of soft, swollen OEM hoses, these 5-layer silicone replacements are an easy, effective fix.
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PSR Silicone Radiator Hose Kit – WRX/STI (2001–2007)
Old school chassis, new-school reliability.
These hoses are designed to withstand the kind of heat your GD/GG chassis never saw coming. They’re thicker, stronger, and more resilient than OEM — perfect for refreshed builds or just keeping the cooling system tight.
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PSR Silicone Radiator Hose Kit – BRZ / 86 / GR86 (2012–2021, 2022+)
Stop heat soak before it starts.
Made for FA20 and FA24 builds, these hoses keep things flowing clean and consistent under pressure. They’re a must-have if you’ve upgraded your radiator or regularly run your car hard.
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PSR Silicone Radiator Hose Kit – WRX VB/VN (2022+)
Factory-turbo, factory-strong cooling.
New-gen WRX builds need cooling to match their output. This VB/VN-specific kit fits perfectly, resists internal collapse, and stands up to track-day stress or just brutal Aussie summer traffic.
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PSR Silicone Radiator Hose Kit – Honda Civic Type R FL5
Track-ready hoses for Honda’s hottest hatch.
Even factory-fit Type R cooling can fall short when you're pushing the limits. These FL5-specific silicone hoses keep pressure steady and temps under control when things heat up.
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➤ Building a BRZ?
Whether you're in a ZC6 or the newer ZD8, this guide breaks down the best upgrades across power, handling, and reliability — with real-world parts that actually fit.
Read the full BRZ upgrades guide →
Radium Engineering
Radium Coolant Expansion Tank Kit – Toyota GR Corolla GZEA14R (2023+)
Built for boost and heat.
This compact, fully TIG-welded tank replaces the stock plastic unit with a baffled aluminium chamber. It’s designed to handle aggressive driving and sustained engine load, with zero risk of ballooning or cracking.
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Radium Coolant Expansion Tank Kit – Honda Civic Type R FK8 (2017–2021) / FL5 (2022+)
No more plastic. No more pressure worries.
Whether you’re in a tuned FK8 or tracking your FL5, this Radium tank keeps your coolant where it belongs — and looks damn good doing it. It’s a direct bolt-in solution with upgraded internals and a billet cap.
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Radium Coolant Tank Kit – Nissan GT-R R35
Serious cooling for serious builds.
The R35 needs reliable cooling under extreme conditions. This expansion tank not only holds up to high temps and pressure, but integrates seamlessly with the factory system. Ideal for street-driven monsters and full-time track cars alike.
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➤ Got a GR Corolla or GR Yaris?
These cars were built to be thrashed — here’s how to mod them for even sharper response, stronger cooling, and power that lasts.
See the GR Corolla/Yaris mod breakdown →
IAG Performance
IAG Performance 69° Low Temp Thermostat – WRX, STI, FXT, LGT (EJ20/EJ25)
Cooler flow, quicker control.
This 69-degree thermostat opens earlier than OEM, allowing coolant to circulate sooner — reducing peak temps and giving your ECU more room to work. A must-have for track and turbo builds.
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IAG Performance Coolant Expansion Tank – WRX/STI (2001–2007)
Aluminium protection for your EJ.
Say goodbye to brittle plastic tanks. This CNC’d, TIG-welded expansion tank fits neatly into GD chassis Subarus and integrates with OEM plumbing. Built to withstand constant pressure and abuse.
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IAG x PWR Triple-Pass Competition Radiator + Hose Kit – WRX (2008–2014), STI (2008–2021)
Built to tame heat, no compromises.
Designed in collaboration with PWR, this 55mm thick core triple-pass radiator maximises contact time and cooling efficiency. Comes with a high-temp silicone hose kit — perfect for big power EJ builds.
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IAG Performance AN-Style Thermostat Housing – WRX, STI, FXT, LGT (EJ20/EJ25)
Rethink your plumbing setup.
This billet housing lets you convert your thermostat outlet to AN-style fittings, giving you greater flexibility for custom cooling line routing. Ideal for race cars and high-powered street builds.
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IAG Performance Wiggins-Style Thermostat Housing – WRX, STI, FXT, LGT (EJ20/EJ25)
Zero-compromise fitment and seal.
Designed for ultra-high-performance applications, this Wiggins-style housing replaces the OEM outlet with a motorsport-grade clamp solution — ideal for builds running pressurised systems or big coolant volume changes.
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➤ Driving an Audi RS3 or S3?
These turbocharged rockets need smart airflow and cooling management to stay sharp. This guide covers the top mods to make them pull harder and stay safer under pressure.
Check out the Audi RS3/S3 upgrades guide →
Cobb Tuning
Cobb Coolant Overflow Tank – WRX VA / STI VAB (2015–2017)
Better function. Cleaner fit.
Made from formed aluminium with a black powdercoat finish, this tank replaces the ugly, failure-prone OEM plastic unit. It uses a CNC’d cap and TIG-welded construction for reliability and show-car looks.
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Cobb Silicone Radiator Hoses – Honda Civic Type R FL5 (2022+)
Track-tough, heat-proof plumbing.
Designed specifically for the FL5, these 4-ply silicone hoses resist expansion and collapse under high temp and high load. Includes factory-style clamps for an OEM finish with upgraded durability.
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Cobb Silicone Radiator Hose Kit – WRX VB (2022+)
Keep it cool, keep it clean.
This direct-fit kit replaces brittle OEM hoses with 3-layer silicone units that hold strong under pressure. Clamps and fittings are included for a tidy, straightforward install on the new-gen WRX.
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Cobb Coolant Hose Reroute Kit – VW Golf GTI Mk8
Smarter flow, cooler temps.
This reroute kit improves coolant flow on the Mk8 platform by addressing a known weak spot in the stock setup. Includes reinforced silicone hose and custom CNC’d fittings for easy install.
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Cobb Coolant Hose Reroute Kit – Audi A3/S3 8V + Golf GTI/R Mk7/7.5
Coolant rerouted, problems avoided.
This kit fixes OEM flow path inefficiencies found on MQB platform vehicles. If you’re tuned or track your car, this is a must-have for reducing hotspots and extending component life.
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➤ Civic Type R owner?
From FL5 to FK8, this is your go-to for power, handling, and cooling upgrades that actually deliver results on the road or track.
Explore the best Civic Type R mods →
Grimmspeed
GrimmSpeed Radiator Hose Kit – Subaru Forester XT SG (2003–2008)
Factory-fit. Rally-bred strength.
Built for early SG-chassis FXTs, these hoses hold pressure and heat without fatigue. Silicone construction resists dry rot and collapse, making them ideal for high-mileage builds and turbo conversions.
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GrimmSpeed Radiator Hose Kit – WRX (2008–2014), STI (2008–2021), Forester XT (2008–2013)
No swell, no sag, no shortcuts.
Compatible across EJ-powered WRX, STI, and FXT models of the late 2000s to early 2010s, this kit is a reliable upgrade for tuned or aging factory systems. Includes stainless clamps and true OE fitment.
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GrimmSpeed Radiator Hose Kit – WRX / STI (2001–2007)
Old chassis, fresh lines.
The GD platform’s cooling system sees real gains with updated plumbing. These hoses are stronger than OEM, better sealed under boost, and cut to fit without trimming.
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GrimmSpeed Radiator Hose Kit – WRX VA (2015–2021), Forester XT SJ (2013–2018)
Modern build, race-ready materials.
If you’re running a VA WRX or late-gen Forester XT, these hoses are a perfect preventative upgrade. Better pressure handling and improved internal diameter consistency equals better flow and less thermal fatigue.
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➤ Rolling in a Golf R?
Tighten it up, cool it down, and squeeze more out of your MQB platform with the mods that matter — not just the ones trending.
Dive into the Golf R upgrade guide →
Killer B Motorsport
Killer B Upper Turbo Coolant Reservoir V2 – WRX (2001–2007), STI (2001–2021), FXT (2003–2008)
Say goodbye to air pockets.
This upgraded reservoir relocates and improves coolant flow through the turbo circuit, reducing hotspots and improving reliability. Built from billet aluminium and designed to eliminate failure-prone OEM plastic parts.
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Killer B V2 High-Flow Water Pump Housing – WRX, STI, FXT, LGT (EJ20/EJ25)
Free the flow, drop the temps.
This cast aluminium pump housing improves coolant flow rates compared to the factory unit. Designed with smoother internal passages and precision-machined mounting faces for leak-free performance in high-heat, high-RPM environments.
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Killer B Water Pump Housing Install Kit – WRX, STI, FXT, LGT (EJ20/EJ25)
All the right parts for a clean install.
This complete kit includes gaskets, O-rings, and hardware to properly mount your Killer B high-flow water pump housing. No digging through parts bins or reusing tired seals.
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Killer B Dual Reservoir – WRX (2008–2014), STI (2008–2020)
One tank. Two jobs. Zero compromises.
This combined coolant and washer reservoir cleans up your engine bay by replacing two bulky tanks with a single, compact, billet solution. Perfect for minimalist builds or shaved bay setups.
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➤ In the BMW M2 or M3 club?
This guide looks at proven mods that make your M-car quicker, sharper, and more reliable — without turning it into a headache.
Final Thoughts
Power is addictive, but heat is limiting. Whether you're planning an all out big turbo build, chasing lap times, or just want your build to run cleaner and last longer, cooling upgrades are the foundation for everything else.
Pro Speed Racing stocks Australia’s best brands in one place — no overseas shipping headaches, no compatibility guesswork, just bolt-on solutions built to go the distance.
Add your car to your garage, filter by what fits, and build your cooling system like your power depends on it. Because it does.
Still have questions?
Our team knows these parts inside out. Whether you're chasing a specific setup or just need honest advice, we're here to help.