Collection: Toyota GR Yaris Gen 1 Performance Parts & Upgrades

Toyota GR Yaris Performance Upgrades & Aftermarket Parts

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Toyota GR Yaris Performance Upgrades & Aftermarket Parts

Unlock the full potential of your Toyota GR Yaris with high-performance upgrades engineered for real drivers. Built from Toyota's rally DNA, the GR Yaris is already a benchmark in the hot hatch world — but with the right aftermarket parts, it becomes something truly special. At String Theory Garage, we offer a carefully curated range of GR Yaris performance upgrades designed to enhance power, handling, braking, and reliability without compromising drivability.

GR Yaris Intake & Exhaust Upgrades

From carbon fibre induction kits and performance air filters that sharpen throttle response and turbo spool, to cat-back exhaust systems, sport cats, and OPF deletes from Milltek, HKS, and Akrapovic — our intake and exhaust range transforms the G16E engine's character without sacrificing road legality.

GR Yaris Suspension & Coilovers

Sharpen turn-in and stability with our coilover kits, lowering springs, anti-roll bars, chassis bracing, and adjustable suspension arms. We stock AST, Eibach, Hardrace, H&R, and MOTON — trusted names selected to work together as a balanced chassis package, not just individual upgrades thrown at a problem.

GR Yaris Braking Upgrades

Explore big brake kits, floating disc & bell kits, braided brake hoses, and high-performance brake pads from AP Racing, Tarox, Carbotech, Pagid, and Ferodo. Whether you're running trackdays or spirited road driving, our brake upgrades are chosen to match the GR Yaris's increased power and cornering ability.

GR Yaris Engine & Drivetrain

Supporting modifications including engine cooling upgrades, oil coolers, gearbox components, clutch hubs, and ECU maps ensure your build remains reliable under sustained hard use. We stock CSF, HKS, CUSCO, and MOTUL — all tested and approved for the G16E engine and GR-FOUR AWD drivetrain.

GR Yaris Wheels, Interior & Exterior

Complete your build with lightweight alloy wheels, wheel spacers, bucket seats, half roll cages, harnesses, and carbon fibre exterior components. Every product is selected with fitment, quality, and real-world performance in mind.

String Theory Garage is trusted by enthusiasts who value engineering-led performance, motorsport-proven components, and expert support. Browse our Toyota GR Yaris Gen 1 (2020–2024) upgrades below and take the next step in transforming one of the most exciting performance cars of the modern era.