gaskets

Does anyone know if you can reuse the exhaust gaskets, or do you always need to replace? I'm currently modding a standard 2nd can bought of Ebay, will probably be changing it about quite a bit, so would be handy if I didnt have to buy new gaskets every time i swapped. I know some bikes use crush...

Hi Guys. I've hammered my credit card and bought myself a new Leovince exhaust. I'm fairly new to working on the bike myself but I'm pretty mechanically minded am determined to learn. It's just the experience I don't have. I've got all the tools & copper grease I'll need to fit it. My question...