i went through this with the ryco rep a year or so ago. the correct filter for a evo(early) engine is z411, the z79 and z142a were older style filters and as said previously there filtration and flow rates were not correct for the evo engine. but then late 1990's some time the z142a had a revamp to use on one of the hyundai engines and got updated with flow and filtration to a standard above the previous, and then is fine to use on evo engines. it does contain a larger amount of filter paper inside, but both will meet oem standards of mitsubishi.
i have always use the z142a being a fatter but shorter filer giving more room for dump pipe.
filter relocator is good idea to use a z9 filter also.
and after seeing some compairsons in filters in tests and just seeing them pulled apart, you cant go wrong with a ryco filter, just to prove the point he asked us to choose a filter size at random from our store, and then cut three different brands apart and there was much difference.