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.
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Evo Corse MonteCorse 18x8 ET28 - For GR Yaris
Regular price From £1,300.00 GBPRegular price£1,400.00 GBPSale price From £1,300.00 GBPSale -
Evo Corse MonteCorse 18x8 ET35 - For GR Yaris
Regular price From £1,300.00 GBPRegular price£1,400.00 GBPSale price From £1,300.00 GBPSale -
Evo Corse MonteCorse 18x8 ET45 - For GR Yaris
Regular price From £1,300.00 GBPRegular price£1,400.00 GBPSale price From £1,300.00 GBPSale -
Evo Corse SanremoCorse 18x9 ET30 - For GR Yaris
Regular price From £1,425.00 GBPRegular price£1,400.00 GBPSale price From £1,425.00 GBP -
Evo Corse SanremoCorse 18x8 ET35 - For GR Yaris
Regular price From £1,300.00 GBPRegular price£1,400.00 GBPSale price From £1,300.00 GBPSale -
Evo Corse SanremoCorse 18x8 ET45 - For GR Yaris
Regular price From £1,300.00 GBPRegular price£1,400.00 GBPSale price From £1,300.00 GBPSale -
Evo Corse SanremoCorse 18x9 ET35 - For GR Yaris
Regular price From £1,425.00 GBPRegular price£1,400.00 GBPSale price From £1,425.00 GBP -
Cobra Nogaro Club Sport Bucket Seat Kit- Full GR Yaris Package
Regular price From £1,875.00 GBPRegular priceSale price From £1,875.00 GBP -
Cobra Nogaro Circuit Bucket Seat Kit - Full GR Yaris Package
Regular price From £2,150.00 GBPRegular priceSale price From £2,150.00 GBP -
SaleRecaro Sportster CS
Regular price From £1,624.00 GBPRegular price£1,944.00 GBPSale price From £1,624.00 GBPSale -
Recaro Classic Pole position
Regular price £2,086.00 GBPRegular priceSale price £2,086.00 GBP -
Recaro Pole Position ABE
Regular price From £1,152.00 GBPRegular priceSale price From £1,152.00 GBP -
Lifeline Copse 2x2 6 Point Harness - Black
Regular price £350.28 GBPRegular priceSale price £350.28 GBP -
Verkline GR Yaris Complete Suspension Kit
Regular price £10,999.00 GBPRegular priceSale price £10,999.00 GBP -
Eibach Pro-Kit GR Yaris
Regular price £325.00 GBPRegular price£354.38 GBPSale price £325.00 GBPSale -
Eibach Pro-Kit GR Yaris Gen 2 Facelift
Regular price £344.18 GBPRegular priceSale price £344.18 GBP -
Wedssport SA99R Wheel - 18"
Regular price From £1,180.00 GBPRegular priceSale price From £1,180.00 GBP -
Wedssport SA-25R Wheel - 18"
Regular price From £329.00 GBPRegular priceSale price From £329.00 GBP -
Wedssport SA-10R Wheel - 18" x 9.5j
Regular price £388.46 GBPRegular priceSale price £388.46 GBP -
Wedssport TC-105X Lightweight Wheel - 18" x 9j ET32
Regular price £650.00 GBPRegular priceSale price £650.00 GBP -
Nankang NS-2R Track day / Road Tyre
Regular price From £80.00 GBPRegular priceSale price From £80.00 GBP -
Ohlins Road & Track DFV 1 Way Coilovers - Toyota GR Yaris
Regular price £3,400.00 GBPRegular priceSale price £3,400.00 GBP -
Alcantara Handbrake Lever - Toyota GR Yaris
Regular price From £149.95 GBPRegular priceSale price From £149.95 GBP -
Lamspeed Racing Toyota GR Yaris / Corolla G16E-GTS Baffled Oil Pan
Regular price £322.45 GBPRegular priceSale price £322.45 GBP





















