String Theory Garage will be closed to the public from Wednesday, 29th July to Thursday, 6th August for our annual shutdown.
If you need to get in touch, please leave us a voicemail or send an email. Our team will happily get back to you when we return on Friday, 7th August.
Shopping online? Don't worry! Our online store will remain active! We hope to ship orders placed for in-stock items as normal during the shutdown. Anything else will be dealt with upon our return.
Thank you for your understanding, String Theory Garage Team
Upgrade the spark energy on your B58 or S58-powered BMW with the MMX Performance High-Output Ignition Coil — a plug-and-play coil upgrade engineered to deliver a stronger, more consistent spark for improved combustion efficiency, throttle response, and power delivery.
Available in the original MMX blue or the premium red high-output variant. Higher output coils are particularly effective on modified or tuned engines where the factory coils may struggle to maintain a clean, consistent spark under increased boost pressure.
Key Features
Greater energy output than OEM coils for stronger, more consistent spark
Plug-and-play installation — no modifications required
Particularly beneficial on tuned or higher-boost engines
Engineered and tested in the UK by MMX Performance
Available in blue (standard) or red (high-output) variants
Sold individually
Vehicle Compatibility
BMW G8x M2 (G87), M3 (G80/G81), M4 (G82/G83) — S58 engine BMW G-Series 1-Series, 2-Series, 3-Series, 4-Series — B58 engine
