Adrenalin-R mufflers are a superb quality made in New Zealand product! Fabricated from 100% T304 aircraft grade stainless steel, they feature patented spiral louvre duct technology to ensure both performance gains and a reduction in exhaust noise when compared to competitors products. They feature a 3-stage multi layer packing comprising of steel wool, ceramic, and then finally fibreglass, meaning these mufflers will last for years – unlike cheaper alternatives that suffer from the packing being blown out of them. Thats why Adrenalin-R come with a limited lifetime warranty! Suitable for use in anything from stock standard street cars to high HP imports, V8s and rotaries. Available in various inlet bore sizes and muffler configurations.