f22a4 header to downpipe: gasket?

[Dr. Shuffles]

I have a stock f22a4. I just took the header off, and I was surprised to see that there's no gasket between it and the downpipe. Should I put something in there when reinstalling, or just leave it the way it was? It was working fine, but I'm just worried that taking it off and on might subtly change the way that they fit together. (Especially since I had to drill out one of the original studs.)

[stunin92_accord]

it would be better if you get a new gasket..sooner or later you will start to smell burn gas under your car or your car would sound like as if your muffler is located underneath your seat.lol

[IBCNYA]

gaskets are just copper rings the insert sround each hole, old ones will be flattened