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The clue was in your first post....the car was down on power (you said!), yet you proceeded to fit the SNABB FMIC anyway, without first making sure that the car was ready for such a big upgrade....

I just did a quick search on eBay and found a subwoofer (w/ the bracket) and the wiring. The subwoofer should also bring the carpet/matt, but cannot understand from this listing if it's included or...

Get the harness from a scrappy that specialises in Volvo, Braydon motor company for example, then buy the subwoofer complete from the site that Ricardo posted. Otherwise, your going to waiting a very...

If it’s not shown in the pictures and you can’t (obviously) see it, then it’s not there.
The harness would never fit under the rear trim as the subwoofer plug is too big.

I’ll be removing the harness from a V70R I’m breaking currently, I think it goes up to rear speakers / Rem area, someone has already asked for it but if it falls through and you need one i’ll let you...

Here you go.

http://www.vpcuk.org/forums/showthread.php?58090-V70-P2-fitting-subwoofer-factory-stock-unit