Help with logic 7 conversion!

I have had an e65 a few years ago with the logic 7 system. I added a small high end amp and subwoofer and was very happy. I have just purchased an e66 and it only has the premium hifi system. It seems to sound the same as my logic 7 system when I would turn off the dsp/logic 7. also,if im not mistaken it seems to have the same speaker count as well.
My question is cam I buy a logic 7 amp and convert my current setup to a logic 7 ?
Any help would be awesome.
Thank you.