The Yamaha YFZ450 Quiet Core Insert is designed to lower the db levels of the
Classic exhaust systems by as many as 4db with minimal horsepower loss. The
Quiet Core is only available for the "Classic" model Dasa Exhaust System.
Quiet Core db Levels:
*Results may vary depending on modifications to your engine and age of
packing material. All levels are based on a slightly modified engine with new