For those of you who have done this:
Did you notice a big difference in smoother idling?
Did it fix any headlight dimming issues(if you had any caused by amplifiers)?
What gauge wire did you use?

 

BIG difference...not a really in idleing yes it was smoother slightly but some wouldnt notice it.
Headlights dimming i notince a lot but then again i do need a secnod battery and a cap

 

Can someone tell me how many feet are required for the big 3? Also, can the big 3 be combined with the grounding kit DIY?

 

This is what ED has listed for their kits, which should work fine:

3 ft. ground to chassis
4 ft. ground to engine block
8 ft. power to alt

 

thank for the pics, i am going to do it soon

 

I just did this upgrade and there wasn't any real benefit to be noticed. Of course my total system RMS is only around 700 watts. I did gain about .5V at the amp though and put my left over wire to better use then laying in my back seat. Maybe my audio is a little crisper, maybe I idle smoother, maybe my dash lights are brighter, but I sure can't tell the difference. I did the big 3+1 with 4 gauge wire. Went from a stable 13.9V measured at the JL amp to 14.399V stable with the car on.