I did not expect this much difference, but boy was this worth it. Bought it completely spur of the moment, and regretted it immediately afterward. Now that I have it and it is in, I am surprised to say it has made a HUGE difference. Went from the factory 540 CCA motorcraft battery to this Optima BlueTop Marine 800CCA Starting battery (not deep cycle)
I had done the big 3 with 0 gauge wiring, and still had some dimming of the headlights, which kind of bummed me out. With this, I definitely am getting better power, though I haven't checked the voltage yet. I have been unable to see any dimming, and my amp is not clipping where it once was, I assume because it is getting a higher voltage and therefore higher wattage of cleaner power.
I also love how the bluetop has some additional accessory posts, normally for marine battery chargers and such, I suppose, but it will make it easier adding small accessories now, given the heavy wire I have to the main posts. It didn't fit into the factory battery tray but should with some slight modification.
I ordered mine from advanceautoparts.com
Use coupon code VISA to get $50 off. I paid $154 shipped (and used DIFFERENT code that only got $36.40 off.
ON TO THE PICS!: