| aFe introduces the all new Twisted Steel long tube headers/connection pipes w/ cats for the 2011-2014 Dodge Challenger SRT-8 with the V8-6.4L engine. Improve your Challengers horsepower with these full length headers and connection pipes. In testing, this system resulted in gains up to +19 horsepower and +17 lbs. x ft. of torque, as measured on AFE's in-house dyno. Designed to replace the extremely restrictive OE exhaust manifolds, the performance Twisted Steel long-tube headers are constructed of 1-7/8”, 16 gauge, mandrel-bent, 304 stainless steel tubing for strength and durability. These headers come with 3/8" thick laser-cut head flanges and gaskets that are designed to match the head port for a leak-free seal. 4-to-1 formed collectors are used on the headers to decrease turbulence and increase exhaust velocity for maximum performance. The high-flowing connection pipes are designed using 48-state legal 200 cell catalytic converters and 3” mandrel-bent, 304 stainless steel tubing for optimum flow resulting in added horsepower and torque. This system is designed to fit as a combo and includes all necessary hardware for a hassle- free installation.
Features and Benefits
3/8" Laser-Cut Flanges
These headers come with 3/8" thick laser-cut head flanges and gaskets that are designed to match the head port for a leak-free seal.
Formed 4-To-1 Collector
Formed 4-to-1 collectors decrease turbulence and increase exhaust velocity. The result is increased horse power and improved throttle body response.
High-Flow 48-State Legal Catalytic Converters
The high-flow connection pipes utilizes 48-state legal, 200 CPSI cats and includes all necessary hardware, which keep the system a true bolt-on and go solution. | 
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