Just finished installing an ifinity bass link powered sub i bought new off of ebay. I'm pretty impressed with the sound.. one hundred percent balanced sound system now. it was a bit of a beast to mount though.. i screwed it to the area where the factory sub goes but its not rocksolid like id like it to be but is good enough for now.. i have heard the factory subs and this one really outperforms it big time.. worth every bit of 170$