The Toyota GR Corolla has quickly made a name for itself among driving enthusiasts. Built on a platform that blends motorsport pedigree with everyday usability, the GR Corolla houses the same 1.6-litre turbocharged three-cylinder engine found in the GR Yaris—known internally as the G16E-GTS. While the two cars share many parts, some differences in chassis and driveline setup mean tuning strategies should be tailored accordingly.
Engine and ECU Modifications
- ECU Remapping: One of the most effective early modifications. Tuners are already unlocking gains of 30–50 bhp by adjusting boost pressure and fuelling.
- Intake and Exhaust: Aftermarket intakes improve airflow, while high-flow downpipes and cat-back systems reduce backpressure. Together, they offer modest power gains and improved throttle response.
- Turbo Upgrades: The stock turbo is capable, but hybrid or full replacement units can offer significant power increases with supporting mods.
Check out our range of intake modifications for your Corolla GR here
Check out our range of exhaust parts for your Corolla GR here
Cooling & Reliability
- Intercooler Upgrade: The GR Corolla’s intercooler is adequate for stock power but can become a limitation. Aftermarket options maintain intake temperatures under sustained load.
- Oil Catch Can: Helps reduce carbon build-up on intake valves, especially important on direct injection engines.
Check out our range of cooling modifcations for your GR Corolla here
Suspension, Handling and Brakes
- Lowering Springs or Coilovers: Improve stance and reduce body roll. Adjustable coilovers offer better track setup options.
- Anti-Roll Bars: Improve balance and reduce understeer in fast cornering without compromising ride comfort significantly.
- Wheel and Tyre Packages: A lighter wheel with a wider tyre profile can reduce unsprung weight and increase grip.
- Performance Fluids: Upgrading brake fluid (e.g. to Motul RBF660) and engine oil supports longevity during hard driving.
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Uprated Brake Pads - Upgrading your brake pads is one of the most effective ways to increase your stopping power from factory.
Check out our range of suspension parts for your GR Corolla
Check out our range of upgraded braking products here
Transmission and Driveline
- Clutch and Flywheel: For higher torque builds, an uprated clutch and lightened flywheel improve durability and response.
- Differential Tuning: Some GR Corolla models come with Torsen LSDs as standard. Upgrading to aftermarket LSDs or adjusting settings can enhance traction, especially on track.
ECU and Software Considerations
While hardware changes deliver gains, they should always be paired with careful software calibration. With differences between the GR Yaris and GR Corolla ECU architecture, it’s essential to use maps tailored to the Corolla’s sensors and drivetrain setup.
Final Thoughts
Whether your goal is sharper road performance or full track readiness, the GR Corolla offers an accessible and rewarding platform for tuning. Start with staged upgrades and keep drivability in mind—many owners aim for a balanced build rather than chasing peak figures.