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For handling source some used C5 Z06 leafs, a good set of shocks, and some good thick sway bars. Will handle better than what most people would ever be able to reach its limits. As far a Nitrous....why? Car makes over 400 now to the tire, also more than most people can ever fully use. I have heard N2O is safe as long as you have the fuel for it. But a common weak area of these engines are the pistons and rod bolts.
To freshen the car and improve the handling I suggest adding C6 Z51 metal end links, C5 Z06 or C6 Z51 sway bars and isolators and new C5 Z06 shocks and leaf springs.
Welcome to the Forum, from just up the road in Hickory!
Lots of great tuners in our area - Nigel Alexander at Brutal Speed and Tuning in Maiden has done our '99. With his racing schedule and customer work it can take a few weeks to get in, but worth the wait.
I know you mentioned still trying to get a Z06 but you already have 410 rwhp. Add the suspension upgrades mentioned by dskinsler83 and Mike98SilVert and you'll basically have a Z06 - just without the emblem!
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Slideshow: A Jaguar designer's personal project imagines what a modern front-engined Corvette might look like if Chevrolet revisited the golden age of the Stingray.