thinking goin to a ns15 firing fwd

[sik99ranger]

hey guys right now im runninng a pair of z12v.3 in my g6 running off 4 arc audio kar1000.1 bx with a pair strapped to each sup each amp seing 2ohm. it loud and gets down! sofar have done a 147 on the windshield! diff box would help but im thinking about going with 1 ns15 and firing it fwd like steve did in his isf! whats your guys thoughts? gonna gain? loose? dont do it? and im sure u g6 guys are saying u got 14in to work with back there but im not affraid to cut anything!! i plan on running the same amps a pair strapped to each coil! whats yalls thoughts??