I have the RMS in my Challenger street/strip car. Mainly for header and oil pan clearance and servicing. I can't run the usually deep sump Milodon oil pans because of how low my car sits. With the tubular K frame I am able to run a flat bottom 10 quart top fuel type oil pan. I can remove both headers and oil pan from underneath without having to pull the engine. Mine is without mounts because I run a front and mid plates. I forgot what the weight savings was? I think it was around or just over 100 lbs off the nose.