Wondering what everyone's thoughts are on re-using the fibre/type (i.e. shiny metal on one side) gaskets, like if you swap from a cat to a decat section? Can I re-use or should I be buying new each time?
Buy new. Had a known garage reuse them on mine after doing a load of work on the car. They blew and sounded awful. I had to replace them myself on axle stands which is annoying, rather than doing the 200 mile round trip. All for the sake of a £5 gasket.