Complete Exhaust System gaskets

[Bunglist]

Just wondering if anyone else has replaced the complete exhaust system on the chim.

I got one from ACT, and it is superb, the neibours really love me now, however i seem to be blowing gaskets around the twin racing cats.

First, the gasket that is between the top of the cats and the manifold end blew, had that fixed and now both lower gaskets where the cats meet the y-piece have blown.

Anyone else had this problem.......