Originally Posted by maxepower

I would like to add to this conversation by saying if your going to use steel screws, use the stainless steel screws. The kit screws, I believe are a little softer than stainless and the weight is about the same. There are many aftermarket companies that make them.

I also would add if your going to do races that there are weight limits then stick with stainless steel but if you run where there is no minimum weight requirements then getting the car as light as you can is like free horsepower.
I would take advantage of any performance gains, since the screws have to be in the chassis anyway, why not spend a few more dollars to make the car lighter and quicker coming in and out of the corners? The average racer probably can't feel the difference but you'll have the potential of saving a few tenths on the lap times for sure!
Just my 2$