I don't have the shields so I should not predict their performance. I usually try to stay more fact based so believe what stroked 6t5 says. If the ceramic stuff is as good as they say it is, it should be even better. There was a guy who claimed he put his fingers on a set of BBK ceramic headers shortly after the engine was turned off and did not get burned. That was a little harder to believe but we will see when I take some temp measurements with mine. Thanks, WEK.