Hey all,

Just bout a HKS Drop in filter not the hybrid one. I noticed the readings on my Apexi TT o2 sensor go relativley low. When the stock filter was in it read generally around 2.20-3.30 but with the HKS its reading 1.50-2.20. Is this to lean? or is everything ok.

Secondly I noticed the Greddy Type RS really start to shoot up in sound. It now makes a hollow psssssh! Is this the correct sound or is the spring setting too soft?

Car does feel more responsive though