-Joel-,
Take note of the location of the other guys posting in this thread mate, UK & NZ, not the hottest places on earth, having been to the UK a fair few times, & living in Tassie for 1/2 my life (similiar climate to NZ) I know it can get very warm, but on average not like OZ (current temps in Adelaide & outer South Australian areas, mid 30's to over 45'c).
Now, I'm not sure with the 32 GTS-t IC, but I can assure you the 33 GTS25t IC (which is probably bigger?) will NOT cope "safely" with more than 10-11psi (YES!!! I mean 10-11psi) without some detonation. It may not be audible, & you might run it higher for a yr or 2, but it's not doing much good in the long term.
If you don't believe me on this, fill up with a tank of 98 fuel, wait till a cool night, go to a spot where you can go WOT a few times, set boost to 12+psi, & turn off the stereo & listen hard as you nail it in 2nd.
Or.... find someone willing to lend you their 32 GTS-t Power FC & watch the dash eng light (PFC uses it as a knock indicator) flash it's tits off!!! Don't think this option will be easy though