BMW E31 850csi Performance Chip
The Midnight Tuning Solutions performance chip tunes the computer for a approximate gains across the entire power band as well as a smoother ride and improved MPGs. Adding a performance chip is still the easiest, most cost effective way of increasing your BMW’s performance with NO downsides. 91 octane fuel is required.
91 Octane Required
New Rev limit : EML controls revlimit
Power increase +11hp
Power increase +20tq