So your pushing around 2000 watts from your system, I would install a 2.5 or even 3.0 farad capacitor (try installing the others you already have first make sure they are close to the amp, why waste more money), purchase a grounding kit for the Z (inexpensive and worth it) and top it off with a brand new heavy duty battery (check your local audio shops they carry some which are made for these kinds of setups). Also what kind of voltage are you reading when the car is at idle w/o the system on? I doubt your alternator needs to be rebuilt but you can always go to autozone and they will check out your alt. and battery for free, if one or the other is bad then you know the problem.

 

my volt gauge shows 14, i know my elec system isnt bad, im just not getting enough juice, the bass is taxing the system. I'm going to do a ground kit, then will throw on one of the caps i have.

 

Nope they dont have nissan?????????

 

Call them, they will work something out for you.

 

another option could also be adding a second battery but I recommend you try a grounding kit, add your exsisting caps along with your current one and a better battery.

 

haha only if he likes to run his stereo without the engine on