As enki mentioned I don't think your getting 1300 Watts from the amps. If you're getting dimming of your lights now you may Consider upgrading the "big 3"(google upgrading big 3"). To be honest you may c solve any issues your having if any with some alternative methods. Iam running 1000w @ 1ohm on my subs and 75w X 4 my other amp on my stock alternator. So I guess Iam wondering why you feel you need the upgrade? If you had 5 amps I would say you should upgrade..right now it seems more of s want than a need which is fine if that's what you want.