what i was going for when referencing the e39, is that the lower speaker accepts up to a 6.5" speaker, but it was too big for that application. so if that was the case for the X5 as well, i'd rather go with the 5.25"

did you ever beef up your electrical system? i was going to put a fatter wire on the ground terminal of the battery. i'd also like to get bigger wires for the alternator, but i'm not sure how big of a job that would be.

i just don't know if i'll need a capacitor for a system pushing about 1000w RMS