You're obviously missing the whole point. SPL and SQ are two totally different things.
Go back and read what I originally said...it's easy to make a car loud. Back when I was competing...that's what I did. But can you make it sound nice? There is more to car audio than boom, boom, boom and hittin' 160db.
My whole point was that MTX is lacking in SQ...maybe I was little harsh when I said they suck, but I still wouldn't buy them.
As for who would hit harder...I don't know. If you have more than 1 sub...which you probably do...it would probably be you.
But I'm not into that anymore...I've been there, done that. I'm 28 with a family now. My car isn't set up for that...and my money is spent on some high quality speakers...I want to enjoy my music now.