Yeah, theres no difference.. the shit doesn't knock off .50 of your time at the track! just makes it to where you can hear more road noise. sucks more when your on the interstate. you need that padding! Theres a web site where these guys took apart, even cut, up this white sentra to see how fast it would really go down the track. They even took out a saw-zaw and went away. I did see the difference between the complete car time and when they cut it to just the engine and the guy sitting in the seat! ..