Anyone know why? Is there a way to add it?

 

The 07 didnt have it, i think in 08 it was added.

 

But it does. Check your manual.

 

I didn't see memory seats in the manual?

 

The memory seats in the +08 RDX models also adjust the side mirrors. The +08 models also upgraded the M.I.D. to work with the RDX’s customizable driver 1 & 2 settings; not sure if the new M.I.D and memory seats are linked together in any way? It might be easier to upgrade to the +08 model compared to retro-fitting a 07 RDX with memory seats.

 

OP, this has been covered before. Search.