thanks guys for all the advice.. hmm under the seats is sounding a good idea at the moment
will make for fairly short speaker cable runs too .
and I guess I could just bolt the amp for the sub to the sub enclosure,
I think I am just going to go slowly slowly and try and run the speaker cabling this weekend and maybe do a dummy fit under the seats.
the head unit powering the speakers as it is now is nice and clean/clear but needs more powaaahh..