Borla CrateMuffler Resonator Option 3in Center/Center 3.5in Round x 10in - Null Sound Center/CenterBorla CrateMuffler Resonator Option 3in Center Center 3. 5in Round x 10in Null Sound Center Center Perfect for applications with limited space. If you want to lower the sound pressure level (SPL) of your CrateMuffler, you can install the Resonator Option. The Resonator Option is designed to attenuate overall sound. This resonator can also be used in any system of this diameter. This is perfect for customers looking to reduce the sound level 2 3 dB(A).
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