Xs power d3400. Same battery I have in the xb. I'm pushing 1340w rms with 2 sets of hid's, led's running through the car, and everything else on stock alt and I have no dimming at all.
I was about to post those pictures. I love s techs. I'mean using them on my xb too. If you want to feel a big difference in handling then get a subframe brace and larger rear sway bar.
I order everything from tuner sports. They will beat anyone's price. I bought a set of tein s techs and the beat amazons price and they were at my house the next morning, not even 24 hrs to ship.