Ive ran subs in my cars and trucks for about 14 years and havent ever used infinity but , they are probley like everybody else they have low end stuff and high end stuff. The low end stuff is most likley crap and there high end expensive stuff is probley good.Your post is kind of vague how much bass are you looking for? If your dead set on Infinity I would google them and buy two mid to high end 12s. I always go with with two subs in a car.
__________________ 1990 5.0 lx, 302 saleen votech intake, bbk 75mm throttle body, cold air intake, bbk headers and exhaust all the way back, bbk traction bars, 373 gears, aod with a shift kit | 
Looking at sound systems 
