Although I haven't touched the stereo system in my E430 (yet), I do enjoy the 10'' Kicker Solo-baric subwoofer in my Prelude. It is powered by a Precision Power amp and through a Precision Power electronic x-over. This amp also runs my four ADS speakers. The sub's bass is very tight. I bought it because it takes very little space compared to other subs and acts like two subs in one big enclosure. Check out www.crutchfield.com. Good luck.

Eric
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'00 E430 w/ Solaris H-7's
'99 SLK230 Sport