well my original plan was to get two FI BL 15's, and i have ordered one and i am using it now and i really like it but my girlfriend wanted a sub just like mine so i have to order two more subs and due to the fact that im going to have an 8 cube box i think im going to go with two FI BTL N2 15's instead, running on a crescendo bc5500 instead of the bc3500 and im going to do the big three with a 270 singer alternator with an overdrive pulley then an xs d3400 under the hood and i was going to have a single d3100 in the back but im guessing ill have to add a second one, and the box is going to be tuned at 33 hertz also. gonna make the little colorado FLEX! Any comments or concerns appreciated!

  

Sounds like it'll get down. You might need another d3100 in the back. Keep what you have and check to see how you voltage is then decide.

If its for daily, I would still get the 3500. No need for 5500 daily. But that's just me.