Evening all. On my last E92 (2008 325i SE) I upgraded the standard factory speakers to the official BMW Alpine kit. Made a big difference to the quality of sound, big difference. Had to buy the tweeter housings for the doors to fit the smaller speakers. These seem to be daft money now, possibly few left in circulation? Do others have experience as to the best non-BMW upgrades for the stock E92 system? I’ve seen quite a few examples on eBay as to speakers, but feel it was the additional of the amp and mids/tweeters that made the difference. Not sure the standard HU/amp combo is up to powering the suggested speakers alone. Any thoughts/experience most welcome.