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All REAL MSD boxes have torx head screws, the counterfeits have phillips.

All REAL MSD boxes heat fins should measure no more then .150", the counterfeits vary and are larger.

All REAL MSD boxes on the end the mag input is on the left and tach output is on the right, the counterfeits are reversed.

These are in packaging that look like MSD and it is hard to tell. Please beware of a "DEAL" on these items.