Here's something to consider, though-
On my 04 WRX when it was completely stock, I saw EGT temperatures of close to 1700 in the uppipe. This CL/OL delay seems to be worse on the 04/05, however, I haven't had a chance to play with an 06 WRX so I really can't say for sure.
In any case, by fixing the CL/OL delay, I would guess EGTs could go down (depending on how the delay logic works).
Adding boost could raise EGTs, but fixing the delay could lower them.