Next step in our designing a custom exhaust system is to baseline what the sound level (DB) our existing system outputs so that as we design after the X-pipe that we have a good flowing 3 inch system but is below a -94 DB sound level.

Here we capture engine RPM and speed in MPH at the same time recording cabin level sounds ( with windows open) as to exhaust sound in frequency and DB level.
Average exhaust sound was around 3300-4000 Hz at around -60 DB

Click below and download 2 exhaust sound recordings.

As we design from the X-pipe to muffler tips we then can compare before and after sound end results and assure we are not above the maximum DB levels tracks limit too.