Copper exhaust gasket

I've been having a lot of trouble with an exhaust gasket on my Ford Falcon ute, damned thing keep blowing out the normal composite graphite exhaust gaskets, I even replaced the exhaust components and still it keeps blowing out the gaskets........ enough!
So I went old school and made a new gasket out of 3mm copper plate:

(before annealing)
I will anneal it before I fit it, annealing is a heat treatment to soften the copper so as it will seal better.
3mm is a bit extreme, 2mm would've done, but I had 3mm laying about.

In the past, I've made head gaskets out of copper for vintage engines when there were no gaskets available for them.
They are even reusable when they're annealed again!
Sadly copper and alloy as used in our engines do not agree with one another, but copper is ideal in many heavy duty steel and iron applications.

I just thought I would post this, to plant the seed of of the idea in case any of you ever have serious persistent gasket failures in the future.
Just remember copper is no good with Aluminum!