HOLDEN HQ-WB 253-308 V8 TURBO G/BOX TUNED LENGTH GENIE HEADERS. Primary Pipe Size: 1 5/8. These GENIE Headers are designed to fit V8 Holden HQ-WB 253-308ci. Please note: these are designed for vehicles equipped with a Turbo Pattern gearbox.We have manifold gaskets available for this set in our store as well. GENIE HEADERS FEATURES & BENEFITS. Mandrel bent primary and secondary pipes. Slotted 2-bolt flange plates (where applicable). Surface ground flange plates for a perfect seal. High-temperature coating rated to 800ºc. Pressure tested during manufacture to ensure no air leaks. How much power can I get out a set of Genie Headers?
Although each application is different, typically you can achieve up to 10% gains in performance and fuel economy. How long has GENIE been making headers for? GENIE is one of the longest standing manufacturers of performance headers in Australia with over 50 years of production behind us.