Semtex don't worry, I am doing mine for sure to either back-up or negate your results. I will be doing it with the full stillen setup to see what happens to the numbers. The point is to get more power out of the car no? I think you have successfully done that and at the end of the day 11whp isn't so bad. I think we will benefit from having the headers once we get into tuning. With the stock tune, we may have lost backpressure and lost a little tq, but once we are tuned and we are flowing more air through the system, we will benefit from the extra flow. Meanwhile those without the headers will suffer a little from the obstruction. I think without a tune, the stock ones are pretty dead on the necessary flow. With a tune, the upgraded ones will be dead on.
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