This should have been done in PMs, as you're asking to rekindle a thread that was brought down QUICK. I'll leave it open if everyone wants to play nice.
First of all, if you say 30 PSI, forget the stock twins. They are barely starting to go out of their efficiency range at 18-19 psi (which is an ideal street setup), and past that you'll be running race gas, which is a waste of money since you're only getting a couple HP for each extra PSI past that. I've never heard of the stock twins running 30 psi, but I have heard of them running 25-29 and replacing the turbos within a week. Not the motor, however.
Plenty of guys running 30PSI on single turbo setups on the stock engine. Plenty. 700-800+WHP, fine. The 2JZ can, and HAS taken it for years on the stock, unopened motor, in daily driving conditions. I know this sounds ludicrous for the other types of engines that you all are familiar with, but how about letting this thread educate you on another reason the 2JZ is so praised and getting swapped into everything (except Civics, sorry to the OP of the other thread).
As far as cranking the boost up leaning out the motor... Well for one, nobody is assuming that this is all being done on a stock fuel system and without any tuning or ECU changes. That's a given. You don't just bolt on the 800HP kit from OurPicturesMakeItLookEasy.com and go run 9s, you get it tuned, and you better have some fuel for anything past 500-550WHP in these cars.
They made it seem like you didn't know what you were talking about because you didn't know what you were talking about. All engines aren't equal; some have different limits, different components they need to have upgraded, different perks and quirks that require specific tuning changes to be made, etc. This is why tuners are specific to certain kinds of cars, and why you shouldn't take your new Supra to be tuned by the same guy that's been tuning your Honda/Mustang/LS1/DSM for years, even if he's the best around for what he does. If you don't know Supras, don't assume you do because you know other cars. That's the kind of misinformation that made the Supra owners laugh in the other thread.
By the way, as far as the dyno queen comment.... Cars aren't dyno queens, the owners are. Nobody buys a Supra for low end torque. They buy them for torque above 3000-4000, where they make a shitload of it. If they want to use that torque for bragging rights, then that's their mistake. These engines SHINE on a road course, and they've certainly been impressing on the drag strip lately, sneaking up on the Viper 6spd record, done with 2.5 times the displacement.