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 compeitors 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. Each muffler comes complete with mounting brackets and removable silencer in the box (except dump and rolled tip styles as silencer will not fit)!