Ok guys, I'm back, this text is copied from the Stage 2 California map notes on cobb's website. Note the first line.
For use with a stock or very mildly modified WRX. Additional modifications such
as uppipe and underdrive pulley are still within the acceptable parameters of
this mapping. When upgrading to a full turboback exhaust you will need to use
the Stage2 mapping. MUST USE FACTORY INTAKE. NO AFTERMARKET INTAKES ARE
CERTIFIED COMPATIBLE WITH THIS MAPPING.
The California specific map addresses lower fuel quality situations and can be
used outside of California if you are exhibiting knock using the Stage1 91 oct
map then it is recommended to use this map.
Target boost pressure is 15.8psi +/- 0.5psi depending on vehicle and conditions.
If after 1-2 weeks worth of driving you are still unable to reach target boost
pressures, you may try using the HWG version of this map.
Target A/F Ratios are mid 12's under load before the onset of boost. Under full
load by 3500 RPM the A/F Ratio will drop to mid 11:1 and gradually run richer as
RPM's increase ending at mid to high 10:1 A/F at redline.
The "Speed Limiter", which in reality just turns off boost control above 130mph,
The Rev limiter at 7250 RPM.
From what I see, if you open up the cats then they highly suggest the stage 2 mapping but not the other way around. I would agree that signifcant performance will be gained from the down pipe and muffler but I still do not see any evidence of danger to the engine, especially with conservative use. If anyone has heard of any evidence of damage please let me know. Otherwise I will continue to run the increased boost pressures.