Check the listing for details. 1320 ultra quiet QW resonator muffler stainless steel universal 3" inlet & out. Color: polished 304SS, Condition: New. Listed at 105.00 USD. 1320 Performance Ultra Quiet quarter wavelength Resonators have become the preferred choice of exhaust fabrication professionals looking to effectively reduce exhaust noise and drone from their performance exhaust setup Our QW design have been proven to reduce 18-22% more drone than standard none QW design. Each Quarter Wavelength resonator features straight through design to reduce back pressure. Our resonator are densely packed with our premium multi-layered sound absorption materials & PREMIUM 304 Stainless Steel construction, polished to a beautiful mirror finish.1320 Performance Ultra Quiet quarter wavelength Resonators have become the preferred choice of exhaust fabrication professionals looking to effectively reduce exhaust noise and drone from their performance exhaust setup Our QW design have been proven to reduce 18-22% more drone than standard none QW design. Each Quarter Wavelength resonator features straight through design to reduce back pressure. Our resonator are densely packed with our premium multi-layered sound absorption materials & PREMIUM 304 Stainless Steel construction, polished to a beautiful mirror finish.