Hi, I read your post about the kline exhaust compared to the EP1. I too am looking for an exhaust that does not have a low frequency "drone" at around 1800 - 2800 rpm. I have a 2007 997 stock turbo and the stock exhaust has that drone when cruising in 5th or 6th at those rpms. There may be something wrong with my exhaust inside it since I bought this used and no one complains about the stock exhuast.

I wanted to know if you feel that the kline is quieter at cruising speeds at those rpms than the EP1. You mentioned that is sounds better since the low frequency tones from the EP1 were getting to you on trips. Does the kline have a drone? Does it seem that the exhaust note is tuned to a higher frequency for the kline thus having a better driving experience without that low frequency drone?