[tmaung]

Check musicarnw.com. You can do different stage upgrades and they are all plug and play. If your 2010 E92 has HiFi then you are all set and very easy to upgrade. I am waiting on the amps right now from them and then will upgrade the speakers another time. Slightly more expensive than getting the items directly but they send the harnesses all ready to plug in. Email them. Ken is very informative and nice to work with and I have only talked to him once for over an hour!