don go for 2 13W7, dat **** will blow your trunk, b/c i got 2 12w7on my bmw,and i know how is w7 work. my cuzin got 3 12w6 on his 98 lexus sc300 ,they are very louds. But everyone said my 2 12w7 way better than 3 12w6. if u want go with 3 12w6 or 2 12w7,all u need JL1000.1 amp, but u want 2 13w7,will need 2 JL 1000.1amp,
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