I'm looking at adding an aftermarket exhaust to my '09 IS 350. How do the Tanabe, HKS, and F-Sport compare as far as sound? I've heard the F-Sport in person and the others only via Youtube. From what I've read, the Tanabe is the quietest, and the F-Sport is the loudest? I also read that the HKS and the F-Sport are the same exhaust. Is this true?

Thanks.

 

There are 2 different HKS, and please do not get confused. Lexus HKS and HKS hi-power.
And yes, Lexus HKS is the quietest, and exactly the same as F-Sport with the exception that the Lexus HKS' right muffler is a real muffler while F-Sport is not. However, HKS hi-power is completely different exhaust and is the loudest among the exhausts that you are interested in.