This.Keep the carpet and the under pad. Your location says you're in Michigan and I can tell you if you pull out the carpet and rhinoline or hurculine the floor, it's going to be really cold in the winter. Also, the carpet and pad insulate from road noise, keep that in mind as well. A buddy of mine did this to his Civic here in Minot, ND and that car was cold as hell in the winter because of it. Keep the carpet.