[Kurokaze]

So does the Spec C 12L Intercooler Tank put the STi in the SM?

[T3h_Clap]

it shouldn't, if anything it adds weight not removes it.

as long as you don't change the function of it you should be fine.

[Kurokaze]

My concern is that in the following section, it states that the intercooler "must be cooled only by the atmosphere, except for standard parts." ... I'm guessing this wouldn't be considered a standard part.

15.10.C.3
As utilized only on engines originally equipped with forced
induction, induction charge heat exchangers (known as “intercoolers”
or “charge air coolers (CACs)”) are unrestricted in
size and configuration. Air-to-air CACs and radiators for airto-
liquid CACs must be cooled only by the atmosphere, except
for standard parts. Body panels, fascias, or structural members
may not be cut or altered to facilitate CAC installation.

[T3h_Clap]

exactly my point.

you're still using the standard parts, just different size tank.

adding the watersprayer to a WRX wouldn't be legal.