Ever since the debut of the GR Corolla, this platform has captured global attention thanks in part to the success of the GR Yaris, which proved the G16E engine’s performance and desirability. Building on our extensive research and development with the GR Yaris, we've applied that expertise to the GR Corolla platform and now offer a wide range of performance upgrades, allowing you to unlock the full potential of this high-performance 3-cylinder engine.

LEGAMAX Sports Exhaust System
For GR Corolla owners seeking to enhance the sound of the G16E-GTS engine, the LEGAMAX Sports exhaust offers the perfect solution. True to HKS heritage, this system delivers a deep, aggressive tone under throttle while maintaining comfort and quietness during everyday cruising. An included Exhaust Error Canceller ensures no unwanted error codes are triggered.

HIPERMAX S Suspension Kit
Designed for enthusiasts who want to elevate their daily driving experience, the HIPERMAX S provides the ideal balance between performance and aesthetics. Engineered for versatility, this coilover system is equally suitable for daily commuting and spirited weekend drives.

HIPERMAX R Suspension Kit
Purpose-built for circuit use, the HIPERMAX R is optimized for high-grip tires and aggressive driving. With up to 4° of front camber adjustment accessible from the wheel well and 30 levels of damping adjustability, it allows precise tuning for various track conditions. Based on our testing with Yokohama Advan A052 265/35R18 tires, we recommend setting damping to 10 clicks front and 13 clicks rear at Fuji Speedway. For better agility and reduced understeer, adjust the rear damping closer to the soft side.

Transfer Oil Cooler Kit
Addressing a known issue where the GR Corolla shifts to 2WD under sustained high-load driving, this dedicated Transfer Oil Cooler Kit prevents overheating of the OEM transfer unit. The pipe-type cooler is designed to operate independently, ensuring it does not compromise the performance of the engine coolant, engine oil, or intercooler systems.

Grommet Head Gasket – Super Cooling Pro
The Super Cooling Pro head gasket improves coolant flow to equalize combustion conditions across all cylinders. In stock form, cylinder No.2 is prone to knocking due to heat buildup. With our revised coolant routing—including passages near the injector seals and between cylinders—knock tendency is minimized, with balanced combustion performance across all three cylinders.

BCD Piston Full Kit G16E HC-TT S3 (Stroker Kit)
This complete stroker kit features our High Compression Triple Tumble (HC-TT) pistons, engineered to accelerate combustion and suppress knocking. It enhances the tumble flow characteristic of the OEM intake port for superior fuel-air mixing. The kit includes WPC-treated I-beam connecting rods with a 25% strength increase and a full counterweighted chrome steel crankshaft. With reduced inertia and the removal of the balance shaft, the 50% balance rate significantly mitigates the typical vibrations found in 3-cylinder engines.

HKS Type-S Aero Body Kit
Complete your GR Corolla build with the HKS Type-S aero package, which includes a front bumper spoiler, side skirts, rear diffuser, and rear wing. Designed to complement the factory styling, this kit enhances the vehicle’s aerodynamic profile and adds an aggressive visual touch.