I just purchased a 1998 BMW 528i. Surprisingly the first thing I noticed was the sound system sounded like crap (NO DSP, NO CD Changer, Just a tape deck). Im debating upgrading the HU and the speakers because the audio system is one of the most important things to me. I want to keep the stock look so I was pondering the Dynavin unit for the E39 (Any reviews please share) but before I shelled out all that money I wanted to try just upgrading the speakers first. I found the BSW plug & play system and im reading mixed reviews about that and its quiet expensive. My question, has anyone attempted to replace the speakers with a component set without using the crossover???? Almost like the plug & play BSW system but i know the wires would need to be modified a little. That way i could replace the speakers and save a few dollars?? Also i was going to add a JL Audio W1 sub and amp. Any ideas, comment, and advice feel free to share!!!