Anyone ever use Mr Gasket Ultra exhaust gasket material?
 

I can't get my 2.5" aftermarket DP to seal to the rear exhaust manifold without a crapload of Muffler Mender (the stuff in a tube) on both sides of the standard metal gasket, and I'm tired of having to wire brush the dried gunk away and reapply each time I take it apart. I'm hoping for a "cut my own conformable gasket" fix.

So, anyone ever use Mr Gasket Ultra "cut your own" exhaust gasket material:
http://www.mr-gasket.com/ProductDeta...minselection=4

Or, can anyone recomend a product they have used that was good?