I was reading last year in a Motor Trend that there is a after market super charger out for the Escalade (maybe it is turbo? I thought it was super though) anyway, it is around $8000, but boosts power from 345hp to something near 480hp or maybe 500 or so, I don't remember to much about it, but that would be an amazing part to throw on.... IIRC it would just bolt right up.