Lexus IS350

Hello all. I was curious about whether anyone has heard/read anything about the compression ratio of the 350, and also, is this engine meant to handle power like the IS300 and Supras did? One of my friends got the IS350, and we've been going to a few places to see what the prices would be like? But neither of us are too sure about what it'll handle safely. He's looking to put maybe a 75-125 shot of nitrous, just for that extra little bit of fun at the track. ANY suggestions/comments would be useful. Thanks