Just to counterpoint the above:
1) The products you mentioned are whole products designed from scratch. The designers can do anything they want with a new product like that, so long as it makes sense for profitability of the product (or in some cases, ahem xbox360/ps2, so long as you can hope to rape a profit on the games by selling the unit at a loss, but I digress). So they get to design to a given final spec up-front without many questions as to whether it's possible.
This is very different from designing an add-on part for a car, where lots of issues are out of your control design-wise, and you just have to see what you can or can't make work during engineering and testing, and then see what ultimate numbers you come up with at that point ($$, hps gains, etc) and report them.
2) For many of the items you listed above, the mfg actually stayed quite tight-lipped about any real details (in some cases, even the existence of the product) right up until launch time. The information the public got was initially largely through analysts' speculations, employee leaks, and the rumor mill. Eventually there's usually a phase just before product launch where they send test units to reviewers and have them sign an NDA that states exactly which details they can release and when, but by that point the design phase is pretty much done. Virtually nobody releases public details while the design phase is still ongoing.
If you want some rough idea of what Stillen is likely to produce, I would recommend looking at the publicly available data on their website for the existing VQ35 supercharger kits they've produced. We have no idea if the new VQ37VHR kits will be very similar to this (there could have been massive design changes perhaps), but even if that's the case, I would imagine they're aiming for similar price and/or performance goals to their past kits, so it does give you a little perspective on what to expect.
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