since you're not going to want anything to big, you might want to look at the torquer cam or something like this 228 cam.
http://www.texas-speed.com/shop/item.asp?itemid=168&catid=44
http://www.texas-speed.com/shop/item.asp?itemid=167&catid=44[url=http://www.texas-speed.com/shop/item.asp?itemid=167&catid=44][/url]