If you’re after a quality muffler or resonator for your build, it’s hard to look past the range of AdrenalinR items manufactured right here in New Zealand. They’re made in-house from T304-grade stainless steel, so quality is assured, and they include patented spiral louvre baffles which disrupt and disperse sound waves, resulting in a lower decibel reading while increasing gas flow through the spiral scavenging effect. The resonators have a 4.5-inch body diameter, and can be made to a range of inlet sizes — from two-inch to 3.5-inch. Need to know more? For more information visit adrenalinr.com or call 06 870 3526.