For the last time.
WITHOUT A PROPERLY TUNED CHIP you will never get the best power curve with REMOVED secondaries. Heck not even a close one since the timing & fuel curve (among 20 other things) has to be completely re-written from scratch!
The PCM IS PROGRAMMED for them to be active, installed, and used properly. If you mess with any of those things and DO NOT change the tuning your are proving nothing other then the fact YOU NEED CHIP TUNING...
...which is a GIVEN from the beginning anyway.
Ah hell this is just easier...
ALWAYS USE THE IMRC.
NEVER TAKE IT OUT.
YOU CAN NEVER MAKE ANY PERFORMANCE WITH IT MISSING! 
