I talked to a tech at STS about raising boost on the banana and here's what he said:
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The official stand point on boost. What ever the kit came with boost wise is the official recommended boost levels. Meaning if your kit left with 7 PSI springs in the waste gates from STS then that is our official recommended boost level.

STS recommended boost levels are between 5 to 7 PSI MAX. Now even though this is our recommended boost level does not mean that you can’t run more then 7 PSI and get away with it. Example I have several customers who have called and ordered out boost controllers and turned the boost up to 10 PSI on there stock LS1, LS2, LS6 ect: and they are doing this with and without methanol, and at there own risk.

So in short what I am saying is! Can you run that much boost on a LS2? Yes, do we recommend it? No, can the engine live at these levels? Depends, good air fuel, spark advance, octane of fuel, good tuning. If all of these conditions are checked and monitored and you fill comfortable running this boost that will be up to you. Just note that 10 PSI on that LS2 is over 700 crank HP 600 tire.

Example I own a 1999 Pontiac Fire Bird Trans Am, it had 100.000 miles on it, I ran 5 PSI boost and loved it, now I wanted to turn the boost up to 8 PSI with methanol because I had seen that other customers have successfully run the same boost and there motors were just fine. Against Rick Squires recommendations who helped me tune the car for 5 PSI I installed the methanol and learned as much as I could about tuning and what is safe and what’s not. I turned the boost up with a new tune that I did my self and ran the car. My car now has 187.000 miles on its bone stock LS1 with intercooler only and I run it as my daily driver with 8 PSI and it still kills a stock C6 ZO6, in conclusion, and against STS recommended boost levels, I turned it up, but only because after researching the tuning and what’s safe I felt comfortable to do so.

I hope this helps you!

What brand are the turbos that come with the STS kit? i've read on some of the GTO boards that a few of the "name brand" kits were coming with really cheap turbos and that's why the manufacturers weren't recommending very high boost.

you could run 10 psi easy. its mostly about the tune. i had tim tune my truck before. it ran good for a long time. i just ended up going with a pro tuner that tunes LS motors all day long. now at any point he will tune for what ever boost i want when i want. i got a life time tune for $500. tuning it key for boost. not sayin you could run 20 psi stock and get away with it. i IMO 10 i pretty fair for you motor.

Get the equiptment/electronics and do it yourself. I dont trust any of the tuners around here to do mine. I set mine up how i want, change it when i want, and dont have to worry about some idiot who claims he knows what hes doing.

i was kinda thinking about your tune as well buzz, not that i know or am claiming to know anything about fuel injection, but i know that in my tuning world, the car ran really strong until i got a wide band and really started to pay attention to what it was doing. once i figured out what i could do with what i had, i broke a frikkin powerglide, picked up gobbs of hp and dropped a conciderable amount of time of my 1/4 ET. so im saying ,your car and motor will only work as good as your tuine. not to mention alot of tunes in my opinion are still in need of a little tweek here and there because of variables in weather and elevation change... o christ, im sure i will get a barrage of technical hoo-eey thrown at me now.. sorry.

the tune is key. take jasons gto for instance, we pulled logs and had it tuned all day sunday. everytime steve williams (tunedbyforst.com) kept pullin more out of it. The tune still isnt finished and we are at 8 updates lol (would have been like six but i put the worng map in it )

tuning is a never finished project that can either get worse or better, depending on everything else in the world you have no control of...

yup tuning is never finished . even when ur rockin a carb . though admittedly a lil easier

I run 2 dataloggers, best investment ive made ....well since that one night in vegas.....

if i ran 10psi on that engine i would be running meth and a PRO tune. i remember a firehawk with a s/c and 10psi that split the cyl wall due to no back up for a detonation problem.

yes it was, because it was never tuned it ran like shit.
that car should of been in the low 11 or mid 10s on the new setup, its now in Texas

yeah i always figured with the 408 and 15 psi it should have really been a screamer, but everytime i pulled up next to it, it was like racing a bone stock cavvy. weird... anyways, it just goes to show you tuning and some configuring goes along way

yeah with the 408 i want to build. i better be run a high 11 in a big ass truck. the biggest difference is ill have it tuned right. i bought a life time tune 2 years ago . i talked to my tuner the other day he said whenever im ready give him a call and he will start tuning.

heavy ass truck=need tons of power/large amount of boostage(bulletproof bottomend)

im thinking about trying 25psi after i get the bar in my car, and the boost gauge that goes higher than 20

I would have to say going with a pro tune is a good idea. Protect your investement!

I always like getting other tuners insight on current tunes. Sometimes you can miss something very little that would make a huge difference in power. Try and send you tune to a pro tuner and see what they think.

Speaking of a pro tuner. Did Paul get compensated for his blown engine since he was pro tuned?