UAS makes some that are bigger but I figure they would be a pain to order.
The HKS FMIC is actually alot smaller than I had thought.the info I received on its size was wrong. So I retract any good thing I have said about the hks fmic in terms of core size as its not any bigger than the hks side mounts apparently. here is a couple of graphs I made by entering the L X H X W dimensions of each core into a generic cad program. it will give you a basic idea of their size.
 
I also compared some of the major cores to 'as similar as possible' dimensions on bell engineerings website to give you an idea of how much a core of that size is rated at.
CORE DIMENSIONS PER SIDE TOTAL
Stock Intercooler 2.25" D x 6.5" H x 6.75" L
Bell core #225062060 2.25" D x 6.2" H x 6.00" L = 149 cfm = 298 CFM
Apollo (one half core ) 3.5" D x 5.5" H x 24" L
Bell core #350056240 3.5" D x 5.6" H x 24" L = 165 cfm = 330 CFM
Greddy 4.5" D x 6" H x 8" L
Bell core #450062080 4.5" D x 6.2" H x 8" L = 282 cfm = 564 CFM
Z1 4.5" D x 7" H x 8"
Bell core #450068080 4.5" D x 6.8" H x 8" L = 309 cfm = 618 CFM
Stillen 3.5" D x 9.4" H x 8.4" L
Bell core #350094080 3.5" D x 9.4" H x 8" L = 332 cfm = 664 CFM
UAS 3.5" D x 11" H x 8" L
Bell core #350107080 3.5" D x 10.7" H x 8" L = 378 cfm = 756 CFM
this should give you an idea as two which side mounts are better and by how much.
AIM: TDMGR33N
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10:30:49 11/17/04
Stillen are the best easy to get sidemounts available. - 
