Well guys, I'm really leaning more towards insulating the 240D with both spray on buytl resonance-blocking material and using the closed-cell foam together. I will try and figure out how much I need to spend, and assuming I do this, I'll document everything in photos and do a DIY and let you know before/after.

I admit, I don't have an audio meter, so it'll be based on subjective measurement by my tired ears.

Thanks,

Packman

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83 240D - 4 speed manual - Manilla Beige
189K miles, Tachometer mod, cool wooden shift knob from PeachParts, CocoMats, Original factory paint, manual windows, manual sunroof. Starting to add AudioWrap to this car too!