At 600 cells per square inch, MagnaFlow direct fit high flow cats offer a 10%-40% increase in efficiency which translates to a 2-6hp power increase on average. The best part is, because the designs come from MagnaFlow, you know that you will get a quality direct fit product that will bolt up without issue and last the life of your Integra. These high flow cats are designed for greater flow and as such are not CARB legal.