Our coilovers are 425lb/in front and 575lb/in in the rear. That makes them roughly 50% stiffer than stock (Z06) at the wheel. They are honestly on the light side compared to other coil overs on the market. We keep them that way for a couple of reasons.
1. 50% is a big increase in wheel rate. For perspective, the T1 springs are only 10% stiffer than the Z06 leafs
2. The Corvette has suspension geometry that actually works, we want to let the suspension do it's thing, not be stiff as a board.
3. We want to keep a rate that actually works on a street driven car without completely compromising ride quality.

Our adjustable shock damping also allows the car to be stiffened up for track use and softened up for street duty.

Hope that helps. I also encourage you to read some of the reviews of our product found on this site. I think they will tell you a lot about the quality and ride of our products.

-Aaron

We have two sets of adjustable sways, Street and Pfatty (competition). The street set ranges from 1.3 to 1.7x the Z06 bars (in rough terms). The Pfatty set starts about 1.6x and goes to 2.5x. Both sets can be used on the street, but obviously, the Pfatty ones impact the ride quality more. All of the stock Corvette suspension packages can use more sway bar. The cars respond very well to this mod. We run our Pfatty bars on our street driven C6 Z51 car with good results. It really depends on what you are looking for.

Keep an eye out on the forums for pictures of our updated sway bar package (new and improved ). It offers even lighter components, a new endlink design and more adjustment. It should be available in 3 to 4 weeks.

Always feel free to call Pfadt Racing or Custom Corvette Accessories for more info.

-Aaron