and yes, its definitely worth it...the GT really really loves breather mods...and if you really want something nice...get the head ported...or get 11:1 internals like I did
your 11:1 is why your GT likes breather mods. Stock GT's see little gains with basic bolt on's.
IMO, header on a GT is a waste of money, the 4hp gain you will get is not worth $400. 7hp or above gain on a celica is a pipe dream at best. Flame away I'm sure the rice boys don't see it that way.