I recently purchased a K&N 57-2553 kit for my 2004 Ford Crown Victoria LX Sport and it sounds great! It's not that easy to put together considering I had to do a few things like redrill the holes to bolt this kit to my car. Took me about 2.5 hours to assemble but the result was worth it. The car has a deeper tone, louder drone, better throttle response and even quieter idle than the stock system. Also, I saved an average of about $150 compared to other sites. I recommend this kit, but I recognize that more work can be added to make this kit work properly.
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