What I can say for sure is that the stock pistons and rods hold 300-330rwhp without any problems so people aiming for that power should not worry (with the right tune of course). Last season I've put in a lot of miles hard driving at those power levels. Guess for higher power levels we will find out this season, I'm hoping they'll be reliable with 83-84 hp per cylinder, if not then I think it'll be time for forged internals .

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190E 3.0-24v (M104 980) turbo @ 0.8 bar
1/4 mile: 2.483 / 13.540 / 175.17 km/h (street tires)