I bet the 275's looks pretty sweet from the back, but that is a bit of overkill from a performance perspective. Did you go with 275/35 or 275/30? The 35's set you at 1/2" taller and the 30's set you at 1/2" shorter. If you went with the 35's you're going to notice a bit of a decrease in torque since your gearing is now tall. Not to mention that's a bit more turning weight to the already overweight rear tires. I hope your goal is "the look" over "performance" here.

Doesn't the SRT6 stick with the 255/35's?

As for your wheels, I like the dark gunmetal look, just don't like the styling...