Originally Posted by Diseasel300

Are you dealing with the carpets fitted to the floor pans or the floor mats? I fixed curly floor mats in my SDL by cleaning them in the bathtub with a mix of detergent, rinsing well, then laying out in the sun on the driveway. They came out all nice and flat, clean, and smelling nice!

For the carpeting inside the car, you'll have to get it hot and press it into place. You might try a clothes steamer and pressing in place until it cools. You need to relax the fibers and hold them in the position you want them to assume.