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there must be alot of undeducated exhaust shops around these days
it took me awhile to get any decent info from them

there are new aftermarket cats available these days
some are euro 4 compliant and i think are 200 ppi
i think ppi is parts per inch or something like that
its basically a figure for the amount of perforations in the cat
the euro 4 this shop were using had say a number of 200
then they said if u really wanted to pass then the very latest cats available where
euro 5 compliant and they have 400 ppi
which is double the holes in the honeycombe when compared to the 200 so the surface area of the material is double so they work much better
he said they use these now for cars that need to pass emissions

another thing u can do is run e85
garanted to pass every test hehehehehe

the problem i think with gas is u might not be allowed to run it on a very new motor
especially if that motor didnt have gas
unless its a heap of **** ford 6 cyl that comes factory with gas but these motors r crap
as the gas side of things always plays up

years ago everyone would run on gas to ge tpassed emissions but im pretty sure the rta stopped that being allowed