Looks like the noise is being compounded by the new amp setup, I found this, it may help re the amp noise.

http://www.crutchfieldadvisor.com/S-...int=1&page=all

Not sure about the gain problems ask over on the e46fanatice I.C.E forum there are some good blokes over their.

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Sept 03, M3, Silver Grey. Retro-fits: Modded Mk4 DVD Drive, OEM Bluetooth, VR Control, Rainbow Speaker Upgrade, Sony SOT Amp, HK Sub, CCFL, Intravee II, NightMode.