Hi Boneyard,
I think what you are asking about the impact is if you hardware is capable enough to hande this new module as well, for the answer of this question let us know which ver. of TMOS are you running if you are running ver 10.x.x. or later you can go to the dashboard and see the current utilization of Memory and the CPU , with LTM on you box you can consider the memory utilization going up by another 20-30% so you can be a better judge if the current ASM is really heavily used and the addition of new module will impact other things or not.
Regards,