Wow those are high, the first place to look is make sure you have enough intercooler and no issues with flow. Then make sure you have a properly sized cold air intake with a well flowing air filter. Other things that would help are a larger intake or turbocharger. High Timing or Running Lean would also create a heat issue
I'm on my 13th Boosted vehicle now (mostly Supercharged, but a couple of Turbo's). I have run as much as 25lbs of Boost on a Supercharger and there were a few that had this issue.... I was running so much boost that when I went WOT it would actually suck the rubber Intercooler or Intake elbows closed, (kind of like a radiator hose will sometimes collapse and no longer flow).
Of course Meth Injection would be you easiest fix and also give you some safety and insurance by preventing detonation as well as keeping your iat's in check.