Empty weight is 200 kilos more. Slightly more than a single R-77-1. Rest isn’t that different because you will still gonna take same fuel and missile payload as Su-30SM anyway. But you will get a nice thrust increase. And if gaijin also gonna give it better fuel consumption you will brobably get away with less fuel that might lead to even better TWR at the start of the combat.
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thinking that wont change is dumb, if it doesnt change it wont matter what missile they add