Save your money on bolt-ons and invest in driving school lessons. You will be able to make dramatic improvements to your car's performance on the road race track or drag strips with better driving skills.
Hell, I know of bozo Viper owners that have bolt-on headers, exhaust and gears that can't break 13 seconds. What kind of sense does that make when a stock Viper runs 12.0 seconds (I have heard of stock Vipers running in the 11.7's and better)? I personally think that bolt-ons are way overrated.
That Z06 is a wonderful and forgiving track car. Go out and enjoy it, and learn how to finesse that car around a nice road course. I guarantee you that you can beat Vipers around the track before you know it.
Be safe.
Brad