....that is the question. I know there are thought and opinions and probably some facts about this as to which is better, that's why I'm asking. I've got a 2006 GMC sierra crew cab and going to build a system. Since I've never built a system for a truck and am looking for SQ not looking to be a ground pounding SPL monster, I want to know what results people have had facing them either way and which has seemed to be the best for that result. I've looked at boxes for both types of applications and from what I see or think down firing would be better. My thoughts are thus because in a down fired box you have the speakers raised off the floor a little to allow for excursion to some degree. Now the boxes I've seen that are forward facing seem like they are very close to the back of the seat, not being able to flex without hitting the back of the seat or even if so, the seat foam will suck up the sound that gets produced causing a muddled sound not representative of what a SQ driver can do. Your thoughts....