Don't know the specs on that one, but I have a 7894 and it is wonderful. As far I can tell, that one is less powerful (45WPC compared to 60WPC) and doesn't include mp3 function.
You can install it yourself for about $20 or less, depending on what adapters the e30 needs.
<span style='color:gray'><span style='font-family:Courier'>1995 e36 3 Series RIP
1999 e46 3 Series BURN IN HELL
2000 MR-S Roadster= Current</span></span>