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adding an extension should not affect the final torque assuming the fastener is being tightened properly in the first place. the length of a wrench would affect the torque but being you're using a torque wrench that is not a consideration.
Again - the length of the wrench does not affect the torque , it only affects the force you have to apply to the wrench to obtain the torque. Torque is being measured at the point of rotation, not where the force is being applied. Take a 2' bar - it does not matter if you apply force at anywhere on the bar or at what angle (3, 6, 9, 12 o'clock) 100FT/LBs of TORQUE is the same, only the force to obtain it changes with distance from pivot point.
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