Recommended systems - components for Car Stereo

JL Audio, these guys are tops in car audio, I use their amps and speakers in my BMW 325ix. I don't believe JL makes a cd unit, only speakers and amps. Consider keeping your head unit, adding a JL amp and JL speakers. If you still want to replace your head unit, look at the JVC's, I have a JVC Digifine head unit that offers state of art DAC for car audio. Stock subs are a joke in most cars.

with a 2 seat sports car, that is a convertible, you need to give up on quality and go for quantity if you want to hear it with the wind noise. You need spl's to enjoy music with a top down. Dynaudio speakers and McIntosh amps are available, but won't sound any better than Alpine or top of the line Sony.

I would suggest looking for an MTX Thunderforms sub to fit in your trunk, if they make one for your B'mer. JL Audio makes the same type enclosure for about 3 times the cost, but in a convertible the additional speed that you are getting for the price will not be noticed.

I would then get some Alpine digital amps (the 4.150) to drive both your sub and your speakers. For speakers, I would look at the higher end, and power handling Polk, Alpine or Boston Acoustic. JL's are great, but won't handle the volumes you need with wind noise.

For a head unit that you want, I would suggest a high end Sony, Eclipse or Alpine, and I would blow off the disk drive and just make sure it has a good iPod interface. If your iPod is loaded with AppleLossless or Wav files, the DAC in the headunit will sound fine.

Good luck!!

PS - if no trunk subs will work, there are some really cool below the seat sub modules that really work for convertibles.

I've seen Mark Levinson car amps and matching bass drivers on e-bay.
Usually pulled from a written-off/parted out Lexus.