I have had way too much time on my hands lately and so I have began thinking about how to get some additional horsepower out of my '99 Sunfire. I was wondering if maybe changing the displacement might help or maybe getting a cold air intake. My car also tends to shimmy around 85 MPH, the problem didnt start until the car was rear ended a few years ago, it wasnt that bad but it has done it ever since. Lastly I live in California so when I look for parts like an aftermarket ecm or supercharger, if it says legal in 49 states I can bet that its not legal in mine so I was wondering if anyone had any clue whether or not it is legal in california to drop a different engine into it like a bonneville 3200 I believe is suposed to be the best conversion. If anyone can help me on any of these questions it would be greatly appreciated.