custom MSP's sidemount is great.
it's the biggest SMIC out there compared to CS and turbohoses.
customMSP utilized every millimeter of space to fit the largest core.
BUT! but, the size of the IC does not make it a drop-in repplacement.
i've installed SMIC's, FMIC's and hardpipes on several MSP's.
i myself own a CS SMIC so i know it's not my lack of installation knowledge.
when installing CustomMSP SMIC into my friend's MSP we had to bend a piece of subframe that supports the left headlight and goes down to bumper support.
it also does not utilize the bottom extension that goes into the rubber support (unlike CS and turbohoses), and thus we had to make a rubber plate so that the SMIC would not rattle against the bumper support beam.
the fans do not sit flush either, with CS SMIC they do.
my CS dropped right in, took 30 min.
CustomMSP took 4 hours.
all that said i would still get customMSP's SMIC. it is a quality made piece, and is the largest SMIC made.
my friend is very happy with his purchase.
just be prepared to modify your car to make it fit.