A jet with radar ON is never stealth! A F-35 with active radar seeking is so stealth like a lighthouse at night. A interceptor must be fast, should have an outstanding radar and good maneuverability (the cream on top of it).
Stealth is good to sneak behind enemy lines. It can be a advantage in the case of the operational profile for the F-22, passive radar seeking, data link and so on. The operational profile for the Mig-41 requires not really stealth, maybe it will get some stealth characteristics (better to have it, than not to have them) but it will be only weak stealth characteristisc, based on shape and RAM coating for high temperature (no foam, polymere, carbon based stuff). Weak stealth characteristic is ok, it means not wasting too much money for it, better putting the money in other characteristics.