Sone304 |best| Jun 2026

On welding forums (e.g., WeldingWeb, GarageJournal), fabricators building custom cat-back systems began referencing "sone304" as a design target: "I want the sone curve of an X-pipe but the material of 304."

When tuners talk about , they are often referencing a target loudness curve for a 304 stainless steel exhaust system. The goal is to achieve a specific sone rating at idle, cruising RPM (2,500–3,000), and wide-open throttle (WOT). sone304