Clean up your engine bay! Manual transmission NDs come with a "sound tube", designed to transfer intake noise to the interior of the car. It's a bit of a goofy deal for a light weight sports car. And you just know some of those hard plastic parts are eventually going to get brittle and break on you, which will cause a check engine light and the potential for foreign object damage in your engine.
Delete it with this simple kit! Insert the 6061-T6 aluminum adapter into the intake tube and attach the valve cover vent. Pop the plastic cap into the hole left in the firewall. Enjoy a 1 lb weight savings and a cleaner area underhood!