Keep your headers legal.

Now you can have over-the-top power and torque of open headers and still meet all of your sound requirements. These 18-gauge steel exhaust inserts fit directly into your header collectors and reduce sound output without restricting power. The two-disc inserts are for racing applications and meet NHRA noise requirements, while the three-disc inserts are for use on street/strip vehicles.

Originally posted by Stokdd
Found a thing in Summit that goes in your header collector. It's supposed to reduce noise without restricting power. Don't have any inspection whatsoever here in Oklahoma, and would love to legelly run open headers. Problem is I have no clue how this thing would sound...........