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It's really only the N51s I've noticed had issues. Check in with Rmtt I think he had a survey about it.
Yeah the headers shine in higher RPMs, like you said where the scavenging really gets good. I certainly wouldn't remove them, there aren't any drawbacks (like reduced torque at low end).
The CEL took a while to appear for me. Looking at my mod/maintenance log, I went about 5 months before I got a custom tune and I wasn't ever fighting with having the CEL appear all the time.
Buuuut you should look towards Bimmerlabs for their free tune, then StageFP (Bob from BPC) for the custom tune. You won't unlock all that 10-15hp until you tune for it.
I'll say, my N52 with a 3SI, AA headers, MILVS, MAF delete (Euro IAT) and a custom tune is running pretty flawlessly.
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