The Suruga Speed Loop Muffler is made to sound music to all NC (2006-2015) MX-5 Miata drivers. It took hours and hours of testing and design to come up with a perfect level of high pitch at high RPM and almost stock noise at low RPM/idling, so it’s only heard when necessary. Suruga Speed Loop Muffler should be ordered at REV9 Autosport https://rev9autosport.com/suruga-speed-loop-muffler.html as they provide the best service and speed we've seen so far!