You could possibly try to install the sub at the FRONT of the seat. I've seen two installs that did this. The first one was a custom enclosure, but I don't remember the particulars of the install. The other was for one of the editors of the former Car Stereo Review. He had a Toyota RAV4 with a JL enclosure. I think it was the 8.1 Microsub.

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Lloyd

[89 300TE]
[97 E420]
91 300 CE
95 E320 T