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Meet our team

At GSM Performance, we’re a small, family-run business built on genuine passion and dedication to motorsport. Based in the UK, we proudly run the country’s only physical showroom of its kind – and every appointment, every update, and every phone call is handled personally by us.

Garreth Sleigh - Owner and Founder

Founder & Everything Else

I started GSM Performance with a vision to bring expert motorsport knowledge and top-tier service under one roof. From sourcing products to developing our websites, managing the showroom, and overseeing customer service – I keep everything running. If you’ve placed an order, sent an enquiry, or seen our social media – chances are, I’ve had a hand in it.

Cameron Marrison - Admin And Instore

Website & Appointments

Cameron joined me in 2020 and has become an essential part of how we run things day to day. He handles all our website updates, books and manages in-store appointments, and takes care of the admin that keeps us moving smoothly. If you’ve visited the showroom, you’ve probably met him already!

CallyAI - Advanced AI Phone Agent

Advanced AI Phone Agent

Cally is our newest addition – and one of the most advanced AI phone agents in the motorsport industry. She’s trained on our entire knowledge base and improves every single day. Whether it’s booking appointments, answering product questions, or providing order updates, Cally can help you 24/7 – and she’s getting smarter all the time.

Putting you first

We’re dedicated to delivering an exceptional customer experience every step of the way. Week by week, we refine our systems, improve our service, and focus on what matters most – making sure you feel supported, informed, and confident in every interaction. Don’t just take our word for it – our customer satisfaction ratings speak for themselves.

Facebook Rating 90%
Google+ Rating 94%
eBay feedback 98%

3 reasons to trust us

  • Your Safety Comes First – As motorsport safety specialists, we prioritise your protection above all else. #SafetyFirst

  • Real Experience, Real Advice – With over 2,500 sq/ft of showroom space, we offer genuine, hands-on product knowledge you can trust.

  • More Than a Sale – We’re here to build lasting relationships, starting from your very first visit or order.

Harnessing Technology

We’re constantly harnessing the latest technology to push our service to the next level. From cutting-edge customer communication tools to advanced fulfilment and management systems, every part of our business is built for efficiency, accuracy, and growth. With each sale, our systems evolve – making your experience faster, smoother, and more reliable every time.

What our customers say

Top genuine guys with great equipment and service! Felix is very polite, very punctual with meeting all of my car needs! I would recommend this company to anyone. Thanks guys hope to see you again soon.
ITA Avatar
ITA
2/06/2019
Fantastic Company and Service, GSM have kept me updated at every stage. The Sports Seats have now arrived top quality finishing, can’t wait to fit them. I belong to several Car Clubs including BMW Cornwall and will certainly be recommending GSM performance to my colleagues.
Andrew Antrobus Avatar
Andrew Antrobus
8/17/2024
Fantastic customer service. Recently bought a seat towards the lower end of their price range and they were more than happy to help from start to finish to make sure it was right for the application. Spot on.
Alex B Avatar
Alex B
7/22/2019
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Before you leave. Is there anything I can assist with? With 17 years of industry knowledge and hands-on experience, I’m here to help. Let’s get you race ready!