Unless you know what you're doing and can take Chevy's track package and improve it, don't F with it.
I had my first track day on Friday (ever, let alone the 1LE), and I was taking out / passing Millers Cup Spec Mustangs with slicks and a Saleen 302 mustang that was trailered to the track on an all stock 1LE.
Drive the car. Know what it can do. Then modify it if you have to.