If you have a BORLA? ATAK? system part number 140792 or 140792BC and want to turn down the volume a bit, replace the front resonators with this set of "S-Type" resonators. Each resonator is built from premium T-304 stainless steel, superior to T-400 series knockoffs (such as 409) to give you the best in performance and duarbility. Ultra-smooth mandrel bends ensure maximum flow & power, and precision computer numerical control (CNC) manufacturing ensures an accurate fit. As with all BORLA? products, it is covered by the famous Million Mile Warranty.