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HFV or High Flow Vane technology is our proprietary customization of the variable vane cage and nozzle ring assembly
2020+ Chevrolet Silverado 2500HD/3500HD (6
with great drive ability around town
They should be used where extremely high RPMS cause severe rod bore close in
1994-1998 Cummins 5.9L Steed Speed T4 12V Competition Exhaust Manifold w/ Wastegate (COMPT412VWG) Chevrolet Silverado HFV or High Flow VaneSteed Speed Manifolds are CNC Machined from 1018 Mild Steel Billet and finished with a satin black coating of Techline, these aren't your typical cheap cast or tubular manifolds. Steed Speed engineers some of the finest manifolds on the planet. The Techline coating is capable of handling up to 1700 degrees continuously and up to 2000 degrees for short periods. Steed Speed warranties workmanship for as long as you own the manifold and a 1 year warranty
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