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
The Pro-Kit is Eibach's best-selling lowering spring — it drops the centre of gravity, tightens up body control and fills the arches properly, without the compromises that come with a full coilover kit. It's tested to work with the factory dampers, so there's no need to change shocks alongside it.
Technical specification
Lowering: 20 mm front / 5-10 mm rear (M4/M4 Competition); 15 mm front / 5 mm rear (M4 CS)