im running two 900watt subs with my u/d pullies with no problems whatsoever...ive got the bbk ones...they look nice too
i noticed a touch more power and much better highway gas mileage! i do a lot of highway driving (to and home from school) and it used to take me 3/4 tank to drive uf to home, 200miles (did it about 25 times roundtrip)....and 3/4 was my best average....and never did i make it in 1/2...no matter the conditions of my driving...first trip with em on...i made it in half a tank....weird!
but i loved it...