Saving for President prerogative

[Nothing in section fifty-four or section fifty-five shall derogate from the right of ²[the President] to grant pardons, reprieves, respites or remissions of punishment 3 [:]

3 [Provided that such right shall not, without the consent of the victim or, as the case may be, of the heirs of the victim, be exercised for any sentence awarded under Chapter XVI.]