This is the enclosure as used with the MegaSquirt-III V3.57 ECU. It includes cutouts for the SD card, USB port, and MS3X expansion card. This is the case included with all of our current MS1, MS2, and MS3 V3.57 assembled ECUs. It is required if you are upgrading from an an MS1 or MS2 with the smaller enclosure to MS3. The enclosure is finished in brushed silver. Anodized black is no longer available.