Blow Performance Exhausts has a design and development team with over 50 yearsβ experience in performance engine work. Our product is metallurgically sculptured with the highest quality metals, materials, and coatings Our 3-Step Exhaust Technology increases scavenging and delivers a broad power band on 80ci -131ci EVO & Twin Cam Engines and 107ci β 135ci M8 Engines. Our 3-step headers and NOT to be confused with straight drag pipes. Our product dramatically improves horsepower and torque check out our Dyno Results in our YouTube playlist and Facebook Photo Albums. We distribute to over 50 countries from our USA and Australian warehouses. 5 years full replacement policy. Blow Performance Exhausts is an Australian Company. We manufacture Harley-Davidson performance exhaust systems for closed course competition. Please check your local EPA authorities for street use. [email protected] FACEBOOK @blowexhausts INSTAGRAM @blowperformanceexhausts