Replacing the exisiting amp with aftermarket

[staskaya]

Hi Folks,

I'm looking to replace my existing amp on my x5 which has the nav, sub, all 10speaks system. I had Prof. car radio installer, remove the nav and install after market touch screen head unit in, I'd like to be able to use all my speakers and the existing sub in the car, I've been told I'll need to purchase aftermarket amp to do this. Anyone know what I can get that is very similar to oem amp so the sound quality is back to way it was before, currently I only have half of my speakers running off the head unit and sound quality is ok, I'd like to be able to use all if possible.

Thanks much for any suggestion or comments,
Soner