Installed this 3 years ago, The cat filters are like ~$20 and filter to a better micron rating, which is great. However if you have a truck with a little tune in it, It seemed to starve the truck for fuel in a pull, So I had to install a "holley red" fuel pump, a year or so onward from the pump installation, no issues and no issues with fuel delivery. great cheaper alternative to a airdog or so on.