Can i add a pod filter on a 4G54 ENGINE ?? 94 Mitsubishi Magna ( Sigma ) 4 CYL 2.6L?

yeah, you can do that to any car. If you mean just adding a pod filter, make sure you keep everything hooked up like the m air flow sensor. The best way would be to buy an aftermarket cold air or short ram intake from K&N, Injen, AEM, etc. Just look on different websites and put in your car information and see if they make one for your car. If not, you can custom make one