The Respons II Bias-Adjustable Blow-Off Valve from Go-Fast Bits is designed to solve a number of problems with your factory diverter valve and other aftermarket blow-off valves.Unlike many twin-port dump valves the Respons II is fully adjustable. It offers a complete range of adjustability from fully atmospheric to fully recirculating. As the atmospheric route opens, the recirculating route closes.This means you can finetune the exact amount of noise you want out of the valve and carefully ensure that you have no driveability issues.TMS is technology developed by Go-Fast Bits designed to improve driveability and throttle response.Your factory diverter valve will be designed to open partially under most conditions except full boost.Go-Fast Bits take the opposite approach and design their valves to stay closed except when they need to open.This means that whereas your factory valve will let the turbo spool down and pressure in the intake system drop completely, theirs keeps a little pres