Tin,
Congrats on your build! This is the time period that can be stressful, believe me I know I currently own my 3rd SPF.
I agree with the Avons
for your car. I have had different brands of tires on other SPFs, and found these to have a much superior grip in all aspects. The other posts above about getting the power to the ground are correct. In the past I could 360, or roast the tires at will, with a much smaller motor than you have.
On the Roush vs Kieth Craft issue I have other thoughts.
My build
Great Asp's Superformance - FE Build is similar to yours. The Roush selection is easy, especially if you have ever been to Roush's facility (I have 3 times), or seen their marketing. I selected Kieth Craft as he could build exactly what I wanted, even using the components I wanted. I really loved the personal side of my build at Kieth's place. Two different ways of marketing. I'm sure your 511 will serve you well, and I hope it does.
Keep posting the pics and toss in a dyno vid (pleeeeeaaaasssseeeeee)
E
