It might be possible to hit 600whp with what you have but you can also run into fuel pressure dropping off pushing the stock return less system that hard. I wouldn't do it you I know on my car i ran into this issue . I ended up with Phunk twin pumps and return system fuel feed lines. With your car the just adding the return system should be enough for your goal.
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Driven Motorsports Single Turbo 7675 T4 1.32 A/R 995WHP 780TQ
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