Long Tube Headers for Dodge Challenger (2009-2012) 6.1L SRT-8Optimize Exhaust Velocity for the 6. 1L Gen III HEMI ESF Powerplant Who Its For: Engineered for owners of the high displacement 6. 1L HEMI who are ready to move past the restrictive limitations of heavy factory cast manifolds on their SRT 8 platform. The Symptom: The factory exhaust manifolds on the 2005 2012 Chrysler and Dodge SRT 8 models are a major bottleneck. Designed for mass production and heat retention rather than flow, these log style