Car looks great! We're like twins almost. I've pretty much blacked out everything on my E70 4.8 too. Outside of the running boards, there is no more chrome left on the car. I had every piece of chrome, signal, light fixture, roundel and reflector either tinted or painted high gloss black.
Your truck looks nice and mean. Have you considered wheel spacers? You should. It would provide an even more aggressive stance.
Here's a shot of mine (note the stock 4.8 next to it, for comparison):
