It depends on what shaft you have in your 913.  The weights are 4 grams, 7 gr, 9 gr, 11 gr and 14 gr.  In general, depending on the balance point of the shaft, you can figure about 2 grams per swingweight. 

Thank you for the information. It's not easy to find but now it makes sense.

Cathi, Titleist Club Concierge

It depends on what shaft you have in your 913.  The weights are 4 grams, 7 gr, 9 gr, 11 gr and 14 gr.  In general, depending on the balance point of the shaft, you can figure about 2 grams per swingweight. 

just got titleliest driver 913 d2 and shaft is matrix m2 64gram the club is fell so heavy swing weight is d7  the red color come with is too heavy ? what should I do to bring the swing weight down to c5 thanks

thanks, but how  can i exchange the weight or i have to buy new one it's not cheap the kit cost $80 any advise