I haven't had a box on my truck, but have driven a couple with them. My first and only BOMB right now is the BD III's and the Boost Fooler, and I love them, nice smooth, even power. I bought them used off of here, so only out $400 and didn't have to give my cores to anybody. So, I'm all for injs, but nothing against boxes either. Just figured that I'd give my two cents. BTW I love the quote in your profile. God Bless, James