i live in CA and the fuel here doesn't like "chips" plus for $300-400 and like maybe 20hp? put 3.55 or 3.73 gears in it, you will know the difference quickly, especially from stoplight to stoplight. check your mass airflow for contamination also, doesnt always throw a light, look for fuzz/crust on your hotwire element, especially with a k/n filter, gets them every time. with acess to a scanner, your wot mafv should be over 4.0vdc, if not replace it... on the other hand, northstars haul ass... don't get me wrong, i'm blue inside/out, but after being a cadillac tech and driving them everyday, they move, nothing to say....