Seems the common trend in headers.. I look at headers as a torque-adjustment tool on an engine. Rarely do you see poorly designed headers on factory cars anymore, they are probably one of the only well-thought and designed pieces connected to an engine. It's the balancing point or translation of power if you will. Toying around with headers usually will just shift power from one point and place it somewhere else, rarely does anybody see gains by using them these days.
I installed headers on my previous WRX and the same thing happened.. despite the vehicle being turbocharged, it still robbed torque and gave a very discrete bump in HP between 6000-7000 rpms.. To further make things worse, my friend had the same experience and he hated the headers so much for the torque loss (and that it completely removed the burbly sound of the boxer engine because the headers were equal-length instead of odd-length) that he put his stock headers back on and said the car was so much more streetable because he had his bottom-end torque back again.
I think i'll stay away from headers until Stillen decides to release some generation2 models and invest more time into the development.
-Div
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