MMX Performance Parts — Precision-Engineered BMW & MINI Upgrades, Made in the UK
String Theory Garage is an authorised UK dealer for the complete MMX Performance range — precision-engineered BMW and MINI performance parts designed by enthusiasts, tested in motorsport, and built to last. Every MMX product is conceived, developed, and manufactured in the United Kingdom to deliver real-world performance gains without compromising reliability or everyday drivability.
Shop MMX parts by vehicle:
What Makes MMX Different?
MMX (formerly MMR Performance) has spent over a decade developing performance parts that genuinely improve the way your BMW or MINI drives, sounds, and looks. Unlike many aftermarket brands that simply repackage generic parts, every MMX product is developed in-house — engineered from scratch, validated on their in-house dynamometer, and put through rigorous road and track testing before it reaches you.
The result is a range of upgrades that feel factory-correct in quality, OEM+ in appearance, and genuinely transformative in performance. Whether you're chasing lap times or simply want your car to look and feel better on a Sunday drive, there's an MMX solution for it.
The MMX Range at String Theory Garage
Our MMX range covers the full spectrum of BMW and MINI upgrades, including:
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Engine upgrades — crank hubs, charge pipes, intercoolers, oil catch cans, ignition coils, intake solutions
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Oiling system — billet oil filter housings, lifetime stainless steel oil filters, oil filler caps, magnetic sump plugs, oil thermostats
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Suspension & handling — lowering springs, adjustable drop links, subframe inserts, differential inserts, front control arm bushings
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Wheels & tyres — hubcentric wheel spacers (F-Series and G-Series), stud & nut conversion kits, locking wheel nuts
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Transmission — DCT oil coolers, shift paddles, billet gear shift knobs
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Engine bay dress-up — billet coolant caps, washer fluid caps, fuel filler caps, oil filler caps, temperature adaptors
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Power & tuning — Power Control Modules (PCM) for F-Series and G-Series M-Cars, cold air intake kits
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Exhaust & intake — panel air filters (cotton gauze and Elite tri-foam), silicone intake hoses, cold air intakes
Why Buy MMX from String Theory Garage?
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Authorised UK MMX dealer — all products are 100% genuine
- Expert advice from a team of BMW and performance car enthusiasts
- Fast UK dispatch with worldwide shipping available
- Full aftersales support — we're here beyond the sale
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