Whats the difference between a blowoff valve (BOV) and a compressor bypass valve (CBV)?
A blow off valve like ours releases this pressurized air into the atmosphere, whereas a bypass valve re-routes that air back in front of the turbo so it gets recycled. On some vehicles, such as ones equipped with air mass meter (AMM) fuel injection systems, losing this air after it has already been measured can cause a rich spike (lost oxygen plus same amount of fuel = a ratio of too much fuel). However with a properly set up blowoff valve using the right spring for your application, this effect is minor and usually not even noticeable. For cars with Air Mass Meters the trick is to use a very hard spring to keep the piston closed at idle, otherwise the car will die. Bypass valves are typically much smaller, move a lot less air, and are quieter, great for a bone stock car at stock boost levels. But for those of you with extensive modifications, running more boost, seeking that distinctive sound, or looking to make the most power possible while running the fastest track time, the Craving
