How long does it take the ECU to react and adjust to changes without resetting it. I just replaced my torque box airfilter on my 99 RS with a frame and gasket similiar to the one made by Subaru. Now the car has a low idle and pings around 4K RPM in 3rd gear. I checked all the hoses and the seal on the air box and all looks to be in order. The only mod I have in the intake sysyem is a K&N filter in the fender box, which I've had in there for about 30K miles. Has anyone else replaced the torque box filter?? If so did you have any problems?? I have a new fresh air filter to install just in case.