String Theory Garage, Enhancing your driving experience.

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GR Yaris White Coilovers Lowered Sport Track - String Theory Garage

GR Yaris Specialists

A complete range of upgrades, all tested, developed and proven on our own GR Yaris

Shop GR Yaris upgrades

Future-powered upgrades. For EVs only. Boring is optional.

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Cobra Nogaro Circuit GR Yaris Kit - String Theory Garage Signature Edition

String Theory Signature Seats

Designed to Match OEM Interior but Improve Seating Position

Shop Signature Seats

Akrapovic Exhaust Supplier Fitted UK - Porsche Toyota BMW Audi Nissan

Premium Exhaust Systems for Performance Cars. Stocked and fitting available with String Theory Garage

Shop Akrapovic Now

EVO Corse MonteCorse Wheel Alloy UK GR Yaris Supplier Fitted

EvoCorse Wheels

Designed and Manufactured to Face Any Challenge.

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MILLTEK Exhausts

We now sell MILLTEK Exhausts

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MMX

All MMX BMW Products Now Available

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HKS Exhaust System GR Yaris UK Supplier Fitted

Free Fitting on GR Yaris HKS Exhausts

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Shop by Car

Find parts built and tested for your exact model

Shop all Toyota GR Yaris 174+ parts & upgrades View collection →

GR Yaris Gen 1 2020 – 2024 → GR Yaris Gen 2 2024+ →

Shop all Porsche 313+ parts & upgrades View collection →

911 (992) 2018 – Present → 911 (991) 2011 – 2019 → 911 (997) 2004 – 2013 → 911 (996) 1997 – 2006 → 718 Cayman / Boxster / Spyder 2016 – Present → 981 Cayman / Boxster 2012 – 2016 → 987 Cayman / Boxster 2004 – 2012 → Taycan 2019 - Present →

Shop all BMW 386+ parts & upgrades View collection →

M2 (G87) 2023 – Present → M2 / M2 Comp (F87) 2016 – 2021 → M3 (G80 / G81) 2020 – Present → M3 (F80 / F81) 2014 – 2018 → M4 (G82 / G83) 2020 – Present → M4 (F82 / F83) 2014 – 2020 → M235i / M240i (F22) 2013 - 2021 → M135i / M140i (F20/F21) 2011 - 2019 →

Shop all Tesla EV performance parts View collection →

Model 3 2020 – 2024 → Model Y 2020 - Present → Model S 2012 - 2026 → Model X 2015 - 2026 →

Akrapovic Exhaust System Supplier Fitted Specialist

Akrapovic Titanium Exhausts

Available now for most makes and models

Shop Akrapovic

Shop Akrapovic Exhausts

Porsche 981 Cayman / Boxster / S / GTS | Akrapovic | Slip-On Line (Titanium)

Porsche 981 Cayman / Boxster / S / GTS | Akrapovic | Slip-On Line (Titanium)

Regular price £6,143.46 GBP

Regular price Sale price £6,143.46 GBP
Porsche 911 GT3 RS / Speedster (991.2) - OPF/GPF | Akrapovic | Race Line (Titanium)

Porsche 911 GT3 RS / Speedster (991.2) - OPF/GPF | Akrapovic | Race Line (Titanium)

Regular price £13,430.05 GBP

Regular price Sale price £13,430.05 GBP
Porsche 911 GT3 / GT3 Touring (991.2) | Akrapovic | Slip-On Race Line (Titanium)

Porsche 911 GT3 / GT3 Touring (991.2) | Akrapovic | Slip-On Race Line (Titanium)

Regular price £3,848.86 GBP

Regular price Sale price £3,848.86 GBP
Porsche 911 GT3 RS (991.2) | Akrapovic | Slip-On Race Line (Titanium)

Porsche 911 GT3 RS (991.2) | Akrapovic | Slip-On Race Line (Titanium)

Regular price £3,848.86 GBP

Regular price Sale price £3,848.86 GBP

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MILLTEK - All Products Now Available

Cannot find what your looking for ? Get in touch, we would be happy to help.

Milltek Secondary Cat Bypass Exhaust System for Porsche Cayenne 958 S 4.8 V8 (Non Turbo)

Milltek Secondary Cat Bypass Exhaust System for Porsche Cayenne 958 S 4.8 V8 (Non Turbo)

Regular price £361.92 GBP

Regular price Sale price £361.92 GBP
Milltek Rear Silencer Cup Exhaust System for Porsche 911 (997.1) Carrera / Carrera S

Milltek Rear Silencer Cup Exhaust System for Porsche 911 (997.1) Carrera / Carrera S

Regular price £1,768.13 GBP

Regular price Sale price £1,768.13 GBP
Milltek OPF Back Exhaust System for Porsche 911 (992.1) Carrera S (3.0L T), GTS & Dakar OPF Models

Milltek OPF Back Exhaust System for Porsche 911 (992.1) Carrera S (3.0L T), GTS & Dakar OPF Models

Regular price £2,496.00 GBP

Regular price Sale price £2,496.00 GBP
Milltek Sport Toyota GR Yaris (Gen 2) - Valved Straight Pipe System with Polished Tips - ECE Approved

Milltek Sport Toyota GR Yaris (Gen 2) - Valved Straight Pipe System with Polished Tips - ECE Approved

Regular price £2,556.89 GBP

Regular price Sale price £2,556.89 GBP

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Popular GR Yaris Upgrades

STG GR Yaris 21.5mm Bolt-on Spacers (Set of 4)

STG GR Yaris 21.5mm Bolt-on Spacers (Set of 4)

Regular price £289.95 GBP

Regular price Sale price £289.95 GBP
Rallyflapz Rally Mudflaps – Toyota GR Yaris Gen 1 & Gen 2 (All Options)

Rallyflapz Rally Mudflaps – Toyota GR Yaris Gen 1 & Gen 2 (All Options)

Regular price From £94.95 GBP

Regular price Sale price From £94.95 GBP
Hella Horn Upgrade - GR Yaris

Hella Horn Upgrade - GR Yaris

Regular price From £22.99 GBP

Regular price Sale price From £22.99 GBP
Toyota GR Yaris Rear View Mirror Riser

Sold out

Toyota GR Yaris Rear View Mirror Riser

Regular price £45.00 GBP

Regular price Sale price £45.00 GBP

Sold out

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CARGRAPHIC Porsche Exhaust Valve Control Units - Now in Stock

Cargraphic Exhaust Valve Controller for Porsche 718 Boxster GTS (4.0L) | Spyder | Spyder RS

Sale

Cargraphic Exhaust Valve Controller for Porsche 718 Boxster GTS (4.0L) | Spyder | Spyder RS

Regular price From £330.00 GBP

Regular price ~~£380.00 GBP~~ Sale price From £330.00 GBP

Sale
Cargraphic Exhaust Valve Controller for Porsche 911 (992) GTS | GTS 4 | Targa 4 GTS (3.0L)

Cargraphic Exhaust Valve Controller for Porsche 911 (992) GTS | GTS 4 | Targa 4 GTS (3.0L)

Regular price From £679.00 GBP

Regular price Sale price From £679.00 GBP
Cargraphic Exhaust Valve Controller for Porsche 718 Boxster GTS 4.0 | Spyder (Factory PSE Controlled)

Cargraphic Exhaust Valve Controller for Porsche 718 Boxster GTS 4.0 | Spyder (Factory PSE Controlled)

Regular price £699.00 GBP

Regular price Sale price £699.00 GBP
Cargraphic Exhaust Valve Controller for Porsche 911 (992) Targa 4 | Targa 4S (3.0L)

Cargraphic Exhaust Valve Controller for Porsche 911 (992) Targa 4 | Targa 4S (3.0L)

Regular price From £679.00 GBP

Regular price Sale price From £679.00 GBP

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100% 5* reviews on Google

See what our customer have to say about String Theory Garage

Reviews

Let customers speak for us

from 23 reviews

Great comms, great service with very pleasant and knowledgeable like minded people.
Definitely will use again, they care about cars.

Mr andrew j burns

06/22/2026

Cargraphic Exhaust Valve Controller for Porsche 911 (991.2) Carrera S | GTS

Produktet ble raskt levert, høy kvalitet.

c.s.

05/30/2026

STG GR Yaris 21.5mm Bolt-on Spacers (Set of 4)

El producte és de molt bona qualitat esta molt bé acabat, bona soldadura, només un pero, vaig tindre que pagar 122.eu aduanas

Anonymous

05/27/2026

String Theory Garage

Esta muy bien realizado muy bien, el problema fue que tube que pagar gastos aranceles aduana 122eu

Anonymous

05/27/2026

Garage Whifbitz 3" Stainless Steel GR Yaris OPF / GPF Delete Pipe (Resonated & Non-resonated)

Perfekt look

Anonymous

03/24/2026

Rallyflapz Rally Mudflaps – Toyota GR Yaris Gen 1 & Gen 2 (All Options)

Great team at String Theory. Highly recommend.

T.N.

03/24/2026

SW Motorsports OEM Sliding Seat Lowering Kit - Toyota GR Yaris

great quality

Anonymous

03/09/2026

STG GR Yaris 21.5mm Bolt-on Spacers (Set of 4)

Quick and easy

Justin Snailham

02/10/2026

String Theory Garage

Excellent product and service

Justin Snailham

02/10/2026

STG GR Yaris 21.5mm Bolt-on Spacers (Set of 4)

great communication and fast delivery

sj davidson Motors

02/05/2026

String Theory Garage

great product and communication from seller

sj davidson Motors

02/05/2026

TOM'S Racing GR Yaris Rear Spoiler

The finish of this product is very beautiful and the installation location is specified, which I'm grateful for. Installing the wiring took a little time for the boost sensor coupler, but it was very easy. The actual driving experience was also quite good, and I could really feel the power increase. I'm really looking forward to taking it to the circuit.

将教村瀬

01/28/2026