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SPCorBUST you'll find those gains don't add up in a linear fashion. But rather diminishing returns.
20+15 will net 30-35
2+3+3 will net ~5
And the drive train stuff won't show even that on a dyno. But you will get some of those returns back in total weight lost.
I haven't done much with this car but I had about 10k into my wrx and they weren't spent without lots of research.
I ended up with about 70whp gained after all that. If you added it all up from website claims I'd have a 400whp monster which is impossible on a stock turbo wrx.