If you want to lower the sound pressure level (SPL) of your CrateMufflers, 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). This straight-through design will Not degrade the performance of your vehicle. There is no logo embossment on this part. Reversible design for installation flexibility. High-quality T-304 austenitic stainless steel will never rust. 100% welded construction for strength. Free Flow design for improved performance. High-temperature continuous-filament fiber (CFF) accoustic material for sound control. Natural mill finish can be brushed or polished prior to installation. Best of all, it's made in the USA and backed by BORLA's Million-Mile warranty. Just what you'd expect from the world's most experienced (and most winning) exhaust brand.