Experience our true 450 Volt 3 Pin and 6 Pin CDI boxes with modern, digital electronics. Partsklassik CDI boxes are fully compatible with factory spec CDI ignition systems on the 911, 914/6, and the 3.3L 930. However, unlike the original boxes from Bosch, Partsklassik CDI units won't lose power with increasing RPMs, and we've built in numerous other improvements and protections from external problems. Choose From 3 Options: NEW: You can purchase our CDI in a new, US-made Partsklassik aluminum case RETROFIT YOURS: Send your original Bosch unit in. We'll simply update the internals and send it back. EXCHANGE: Send your original Bosch unit in. We'll send you back an orginal, updated Bosch unit with media-blasted exterior and all decals applied in correct locations.