Would replacing my JL audio 13.5"w2 for w7 worth it?

I have a jl audio 13.5"w2 and it sounds great! But b is my middle name lol, so I'm looking for more. I have no more room for additional speakers and my box is custom made between my seats so 13.5" is the only way to go. So would the w7 make a noticeable difference? If so, I will sell my current one to invest. I have a planet audio 900 watt monoblock also, so is this the best setup for this? Basically I'm trying to get loud and low as possible with one 13.5 lol. Suggestions?