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e90s have a resonator and upgrading to PE deletes that, so the e90 will have a greater increase in sound as compared to stock.
I installed a PE on my e93 about 3 months ago and have not experienced any drone. As others have already commented, the loud (relatively speaking) start up is normal, but it quiets down after about a minute.
I agree with the general consensus that you either: (1) have a slight leak at the clamps or (2) are just more sensitive to drone. I haven't heard of another exhaust that compares with the PE when it comes to drone, given how mild and tame the PE is vs the aftermarket setups.
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