blowing manifold

i keep blowing my exhaust manifold gaskets, i removed my inlet and replaced it with a powder coated one but changed my exhaust gaskets at the same time as it was "farting" abit but after assembling it (bit of a pain with them manifold bolts) it blown again a hundred ish miles down the road, and back to the farting sound again,
its a 4 branch ashley manifold
anyone else had this problem? im using standerd exhaust manifold gaskets

Have you checked all the exhaust rubbers? Checked the nuts haven't worked loose on the manifold? Not come across this problem myself…