Hi! Actually I’m quite satisfied with the performance of my CTR ́s. I had a K&N Typhoon kit in the fall, but it was even more satisfied! ;^) But now I put WR on it and at the same time I prefer the original air filter box installed, but also with K&N replacement filter. Somehow I have the feeling that the car no longer has the kick from 6000 rpm. Is this in the cold weather that the car doesn ́t really run anymore?! Normally a motor runs like this only really when the intake air is nice cold. I also have real problems with estimating whether the engine or the oil is already at temperature. I drive really long until I have the feeling now can ́t go off. I think at least 30min. or 20km. Or has a defect crept in with me on the engine. So somehow the engine has become “severeer” if you can describe it this way. Do you have any idea what is going on?!