Twin Intercoolers vs. Single

[Flash68]

More intercooler discussion here. I searched and could not find any discussion on this topic so here is my thread.

We (my builder and I) are thinking of doing twin IC's instead of a single for a few reasons.

-to be a little different than most
-for an aesthetically pleasing look (to me)
-to line up with the air vents in the lower valance I want to run

Now, this is what I could not find anything on. Is there a disadvantage to this except maybe a little added cost? I see some ProCharger kits (I saw a C5 kit) use twin IC's. Is this is less efficient than running a larger single IC? Maybe the C5 kit used them out of necessity and less space under the hood?

Any insight is appreciated. FYI, I have the ProCharger D1SC.