What is the difference between the 90 and the 91-93's that makes them more powerful? Like I said before, I know nothing about these 2.3's. I've owned several 5.0's and 4.6's and know alot more abou them. The car that I found is my Sister's and I can basically have it. What's the best price you have seen for an Autopower cage? Do you anybody that may have a used one?