Data. Documented. Interesting I checked M&K weight on these components and mine are just a bit under. Confirming why I like buying parts from individual/small suppliers. Like, no robots, man. And we all know the quality/art of Brian’s welding at M&K. I keep track of what comes off and what goes on. Use an old, but calibrated (I have a set of standards from a tag sale find) Hanson scale. It’s not 100% cuz sometimes I skip it and just put the parts on and then think ok I’m not taking that off. At the end - will just weigh the car. Time to install. Debating starting car without the muffler.