K&N Filters are about as valuable to any stock street vehicle as the various oil additives that have been marketed for the last 100 years. In short, air filters CAN NOT INCREASE HORSEPOWER.... At best they MAY allow the engine to develope closer to its actual hp (from 210 @ the crank to 212 MAYBE) but thats all. Save your money. Companies like this make a fortune based on junk science and pure B S. I always have a laugh when someone talks about their HP gains when changing air filters or putting additives in their oil pan. If you want to add cheap HP, add tuned headers and exhaust. Its the ONLY cheap H you can buy, everything else costs REAL money. All you have to do is go to the strip and change filters between runs, do it more then once each , and you'll save money to buy some real HP.