tha great p- idk if you were talking to me about how long i have had my subs and different things but i got mine installed roughly in march. I have only had the truck since december. and i have no idea on db's im pushing. I mean its plenty for me and i have owned subs like these before. Now the L7's will hit more db's and will get where u want wit the 140db's b/c they are ff and the box was made for tech12volt!!! Now for those other subs you posted, i dont see anything wrong with them, the big thing is to make sure the right air space is used and dont over power shallow mount subs, i figured that out, i blew two different sets, thankfully i got them really cheap from a friend but still sucked!!! i love kicker and they have never let me down. L7's are definetly awsome though had one in my taco before this truck and it would bang!!!! just one 12" L7!!!