dude what are you smoking?
if he is getting 140 now he would need another 600 watts to get to 143. it takes 2 times the power to get 3db louder you dont go from 140 to 150 with a better amp. db is exponential not linear its like a ricter scale you dont get 10 db gain from adding a little more power to get 10 db you need much more subs and bigger subs with gobs more power. i have only sat in 1 car that hit over 150 and he had 9 15" subs in the back seat of a sentra.
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