Heck, Naperville North is right by IMSA (so loses a decent number of kids to them every year) but still managed to matriculate grads to Harvard, Yale, Brown, Cornell, Stanford, MIT, Caltech, Northwestern, UChicago, Duke, Rice, ND, Tufts, WashU, and Vandy (as well as Cal and UMich, neither of which are in-state): http://www.naperville203.org/cms/lib07/il01904881/centricity/domain/47/nnhsprofileweb.pdf
Naperville Central’s list was similar.