I have the Langdon's on my 230 with 2 1/4" pipes to the muffs and 2" out the back. Installed by po. It had smitthy's muffs on it but was too rappy for my taste. Just had dynamax short turbo's put on. Quiet at idle (my neighbors like it better now) but nice while drivin' around. The passenger side is longer due to crossing under the motor and is a bit quieter too. Sure wakes up the six.