No. A 200mph Buick isn't Pro-Touring; it is a race car. Everything you read in magazines is designed to sell you things, as it is the nature of their business.
Why do you need to spend hundreds or thousands on parts to achieve the results of a car you can drive/race? You don't.
With a few choice suspension parts, some good tires and brake upgrades you can achieve night and day results that will perform as well as any "kit" out of any catalogue.
I don't have a single "DSE" part on my car and wouldn't waste the money on it either. Usually modified stock parts are good enough to achieve results... many national Solo 2 (auto-x) championships have been won with near-stock, well set up, 3rd and 4th Gen F-bodies. You'd be surprised at the similarities between the G and F-body cars.
My recommendation is that you get yourself into some proper sticky tires and wider wheels (17 or 18" max), quality shocks (not coil overs), stiffer springs and/or an axle mounted rear swaybar (not HRpartsnstuff), a fresh suspension with some existing stock style flex remaining (either rubber bushings in boxed stock arms, or poly-U in stock un-boxed arms), a more aggressive brake pad compounds, and a CG Lock to increase your personal confidence while driving. Lastly, you need to setup your suspension (alignment), tune your tires (pressure) and get familiar with your car in more extreme conditions.
But that means your hands get dirty, you don't get bonus points at the local car show for buying stuff out of a magazine, and might have money left over for other upgrades.