I think you may be the only guy on the planet who wants to boost an Intrigue. I remember seeing a web site somewhere that had all kinds of performance parts for Aleros. But that was a long time ago, I cant seem to find it right now. I think if you are serious, it's going to be custom fabrication and SEM.

Another option, if you just want more power, is finding an L36, which was the 3.8 V6 option for the Intrigue. There was also a supercharged version of it that went into 97-03 Pontiac Grand Prix GTP, or Bonneville SSEi.