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 ignition system on your B58 or S58-powered BMW with the MMX Performance High-Output Ignition Coil — a plug-and-play upgrade engineered to deliver a stronger and more consistent spark than the factory coils. Greater energy output means improved combustion efficiency, sharper throttle response, and more complete fuel burn across the rev range.
Particularly effective on tuned or higher-boost engines where factory coils may struggle to fire reliably under increased cylinder pressure. Available in the original MMX blue or the premium red high-output variant — sold individually.
Key Features
Higher energy output vs OEM coils — stronger, more consistent spark
Plug-and-play installation — direct OE replacement
Improved combustion efficiency and throttle response
