800watt stereo VS Westco Battery

[Ray Sta.Juana]

I just got done talking to the guys who distribute the Westco battery and
they say that for the amount of power I'm running, I would still get the
lights to dim due to the lack of reserve power on the battery. Right now I
still have the stock battery but I have the option of using the Optima
battery that is in the donor car. What have you guys with high output
stereos used to solve the issue of not enough battery? Anybody run a Westco
with a high output stereo? How well does it work? TIA

Ray S
98 Sentra SE
99 Sentra SE-L donor