Review on AEM 20 400S 2 25 Bypass Valve by Christopher Sullivan

If you are new to CAI on a vehicle then this requirement should be in your system. Luckily I learned it before it was too late. My original system had no bypass, and a rainy day on muddy roads almost got me. The bypass lets your engine breathe when the filter is clogged. Over time, at least in my car, the system vibrates enough to crash those laps every 3-4 years over time. No other replacement works properly for my machine and here I am again. But my car has been running great for 17 years in a row.