When I first bought my car it was a real dog. After doing some sound analysis, it now is running real clean. And somewhat peppy. I guess what I am trying to say here is this, If the system is out of spec. the car runs like a dog. I drove a car of the same vintage as mine which was sitting on a used dealers lot. The guy swore that it was recently tuned and in great shape. It ran worse than mine did when I first bought mine. So, the moral to the story is, drive other cars and figure out if yours needs some serious fix or are you POWER HUNGRY. If the later is true, sell the dog and buy the 750. Case Closed.