i had that car or almost 1988 735i

i would set that car up like this a good set of focals with the tweeters in the stock placemints the 5 1/4 in the stock place and do a V looking box in the ski pass (the V make a box that has the two subs in the V i think i would do sealed box )

i can not recall if you can get 6 1/4 in with out cutting
i was winning #1st in that car when i had it

__________________
EVERY FAMILY HAS A RETARD IN IT. IF YOU THINK THAT YOURS DOESNT HAVE ONE, THEN ITS PROBABLY YOU.