exhaust problem

[SaxoStevo]

Alright guys, Well took my powerflow back off as its getting on my nerves as i have been doign long drives so put my magnex back on, i have a 4-2-1 mani but the only problem is, Is where my manifold attachs to the de-cat pipe i have on, the gasket seems to big to fit on the decat. its the right size to fit inside the manifold. know if i can get one with a smaller inside diameter?

[harrytool]

if you get the smaller gasket to fit the decat pipe will it not then be to small for the manifold?
you can get all different gaskets off the shelf but if the two joins are different one will have to be changed so they both become the same!
If its only the size of the bore then aslong as its not leaking when its done up i would not worry about it being bigger as that will not restrict it
i would only worry if it was a smaller dia as that would reduce the flow