Personally I would go with a short ram with a pipe that directs an outside air supply toward it. Instead or risking hydrolock from puddles of rain. Either way both can be purchased for cheap on ebay. Basic difference in intakes are the pipe diameter; 3" is the best for the money.Other mods to increase performance; Stock replacement spark plugs if you have not recently changed the old ones. (better fuel economy too!)Tornado is a joke. any efficiency it makes on the low end will be wasted on the high end by disrupting the air flow. Imagine trying to breath through a tube for air then a tube with a spinner in it. maybe it is ok for a little bit, but then try it while you jog.Hope the analogy was entertaining,KC