Collection: GR Yaris
Toyota GR Yaris Performance Upgrades & Aftermarket Parts
... Read MoreToyota 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.
Whether you’re building a fast road car, track weapon, or weekend canyon machine, our Toyota GR Yaris mods are sourced from trusted motorsport brands and proven platforms. From intake systems and performance exhausts that unlock turbo response and aggressive sound, to suspension upgrades, coilovers, and chassis bracing that sharpen turn-in and stability, every product is selected to deliver measurable results.
Looking to push harder? Explore brake upgrades, lightweight wheels, and drivetrain enhancements that help the GR Yaris cope with increased power and spirited driving. We also support supporting modifications such as engine mounts, bushings, cooling upgrades, and performance hardware, ensuring your build remains reliable whether on the street or at the circuit.
All our GR Yaris parts are chosen with fitment, quality, and performance in mind. We focus on upgrades that work together as a system — not gimmicks — helping you build a balanced, confidence-inspiring car. If you’re chasing faster lap times, improved feedback, or simply a more engaging drive, our Toyota GR Yaris upgrade collection has you covered.
String Theory Garage is trusted by enthusiasts who value engineering-led performance, motorsport-proven components, and expert support. Browse our Toyota GR Yaris upgrades below and take the next step in transforming one of the most exciting performance cars of the modern era.
Read Less
-
Toyota GR Yaris Front Brake Cooling Ducts - Pair
Regular price £166.67 GBPRegular priceSale price £166.67 GBP -
STG GR Yaris 21.5mm Bolt-on Spacers (Set of 4)
Regular price £241.63 GBPRegular priceSale price £241.63 GBP -
AST 4100 Toyota GR Yaris Coilover Suspension Kit (String Theory Signature Series)
Regular price From £2,158.33 GBPRegular price£2,216.00 GBPSale price From £2,158.33 GBPSale -
STG Chassis Package - GR Yaris Gen 1
Regular price £3,208.33 GBPRegular price£3,406.98 GBPSale price £3,208.33 GBPSale -
Akrapovic Toyota GR Yaris Slip-on Exhaust System Titanium
Regular price From £2,472.32 GBPRegular priceSale price From £2,472.32 GBP -
Alcantara Steering Wheel Toyota GR Yaris
Regular price From £329.17 GBPRegular priceSale price From £329.17 GBP -
Cobra Nogaro Circuit GR Yaris Seat Kit - String Theory Garage Signature Edition
Regular price From £2,208.33 GBPRegular priceSale price From £2,208.33 GBP -
Alcantara Gear Knob - Toyota GR Yaris
Regular price From £82.50 GBPRegular priceSale price From £82.50 GBPSold out -
ARTEC Sport 400 Bolt on Turbo Kit - Toyota GR Yaris / Corolla (G16E)
Regular price £3,500.00 GBPRegular priceSale price £3,500.00 GBP -
ITG Carbon Fibre Air Intake Induction Kit - Toyota GR Yaris
Regular price £1,124.17 GBPRegular priceSale price £1,124.17 GBP -
Carbon Fibre Adjustable Blade Varis Style Rear Wing - Toyota GR Yaris
Regular price £665.83 GBPRegular priceSale price £665.83 GBP -
AST Adjustable Drop Links - Toyota GR Yaris
Regular price £150.00 GBPRegular priceSale price £150.00 GBP -
String Theory X Custom Cages - GR Yaris Half Roll Cage - Black
Regular price From £1,316.67 GBPRegular priceSale price From £1,316.67 GBP -
Rally Mudflaps Toyota GR Yaris - All options.
Regular price From £79.13 GBPRegular priceSale price From £79.13 GBP -
STG Carbon Fibre TRD Style Front Splitter - Toyota GR Yaris
Regular price £525.00 GBPRegular priceSale price £525.00 GBP -
Akrapovic Toyota GR Yaris Gen 2 Slip-on Race Line Titanium Exhaust System
Regular price From £2,407.20 GBPRegular priceSale price From £2,407.20 GBP -
Toyota GR Yaris Rear View Mirror Riser
Regular price £37.50 GBPRegular priceSale price £37.50 GBP -
Carbotech XP10™ Front Performance Brake Pads – Toyota GR Yaris
Regular price £265.00 GBPRegular priceSale price £265.00 GBP -
Pagid RSL29 Endurance Racing High Performance Front Brake Pads - Toyota GR Yaris
Regular price £303.83 GBPRegular priceSale price £303.83 GBP -
TSW Imatra Alloy Wheel Matte Black 18x9 ET35 - Toyota GR Yaris
Regular price £232.00 GBPRegular priceSale price £232.00 GBP -
RAYS Steel Locking Wheel Nuts - Toyota GR Yaris
Regular price £81.67 GBPRegular priceSale price £81.67 GBP -
Hella Horn Upgrade - GR Yaris
Regular price From £13.33 GBPRegular priceSale price From £13.33 GBP -
AP Racing 355x28mm Floating Front Disc & Bell Kit - Toyota GR Yaris
Regular price £1,264.38 GBPRegular priceSale price £1,264.38 GBP -
CUSCO Reinforced Transmission Clutch Hub Toyota GR Yaris
Regular price £1,200.00 GBPRegular price£1,231.58 GBPSale price £1,200.00 GBPSale




















