2mAn

Is there a recommended Amplifier upgrade that can replace the OEM Amp, mines an early build with no Bose or anything fancy, but I do have 6 speakers and the stock headunit

PBradz

I used a Soundstream Picasso Nano series amp, have it mounted to factory bracket until I can make something better. It’s small but powerful enough to drive dash+rear Kicker co-ax replacement speakers plus OE door mid/subs.

https://soundstream.com/product/pn1-650d/