for the 1.6l do not expect gains from the intake, unless you want a gain in sound. Injen CAI if you can find one is very nice for looks and sounds amazing. However, with the stock MAF expect hesitation, jumpy idle, and possibly a CEL. Cosmo makes a CAI which looks very similar to the Injen, but I can not vouch for the quality of it. If you go with a cold air intake you may want to invest in an AEM DryFlow Filter seeing how where the filter is placed it is very likely that water will reach the filter. And $40 now is better then $2,000+ for a new motor later.
Link to the other MAF option, which will allow you to use CAI that are bigger then 2.25" in diameter:
http://www.mazdas247.com/forum/showthread.php?t=123681962
as for short rams I think red99pro has you covered for your options.