Not in Marin, but if your friend can take a drive down to the south bay I highly recommend Z-Auto Sound in Santa Clara (they're on Steven's Creek, right across from the Hummer dealership).

They've done two empeg installs for me, both top-notch.

-- Gary F.
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Eeyore, Original Owner -- Mk II 80 Gb, Blue S/N #090000803 Tigger, 2nd Owner -- Mk IIa, 80 Gb, Blue S/N #40103789