I put a set of those in my TTIs. They worked too good at higher rpms. Clouds of smoke while auto crossing too.I had to restrict them and modify the baffles in the vc. Eventually I took them off.
I'm thinking maybe it was the whole autocrossing thing? I'm sure my car will be on as smooth as roads as possible and hopefully in a straight line as most mopars iv owned don't like to go around CORNERS . LOL