No apology necessary. In my short time visiting this forum there is little doubt as to your expertise regarding audio setups in these vehicles. My Blaupunkt sub is installed and really makes a huge difference. It's no neighborhood window rattler, but it fills out the low end very nicely. I purchased it from continentalimports.com (for post above). You can't see it or source the sound.

For others:
If you are looking for big booming license plate rattling bass, this sub won't give it to you by any means. However, if you are looking for rounding out the sound of your basically stock setup with very little effort and modification, it works great.

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1982 Mercedes-Benz 300CD
1982 Mercedes-Benz 240D - stick