How much boost is to much boost?

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Thats pretty pathetic considering that 420hp isn't that much power when it comes down to it (even for a stock k20a). Only making 420hp at 42 pound, no wonder it blew up, the charge temperatures from the turbo must have been hundreds and hundreds of degrees = bang.

Edit: Ok I watched the video and they actually made 588hp, which is pretty impressive for a stock motor regardless of lifespan.