I just received my Keisler kit. I was always under the impression from magazine articles that the floor did not need to be modified other than adding a 4-speed hump if your car was automatic. According to my instructions I am supposed to cut a hole in the tunnel, then take this flat piece of metal with a slit in it and hand form a cover for this hole. Did something change? Did any of you install this plate? If so, does the carpet look funky? If you didn't install this plate do you have interference issues?