Product Combo Performance Gains:

• Produces an astounding +67 horsepower and +171 lbs. x ft. of torque as verified by our in house dyno (Initial test results performed on a 2006 Sierra HD V8-6.6L(td)

Headers:
1/2" Laser-Cut Flanges:
These headers come with 1/2" thick laser-cut head flanges that are designed to match the head port for a leak-free seal.

Construction
These unique headers are constructed of 1-3/4" mandrel-bent 304 stainless steel tubing with a .120" wall for strength and durability.

Optimized Tube Lengths:
Tube lengths are optimized for true pulse control technology which improves flow and performance.

Up-Pipes
Construction
These unique headers are constructed of 2" mandrel-bent 304 stainless steel tubing with a .120" wall for strength and durability.

4" Interlock Flex Pipes: 
The down-pipes utilizes heavy duty 4" flex tubes with internal interlock liners.

Leak-Free Seal:
High quality 3/8" thick flanges are used for a complete 360 degree sealing surface.

Down-Pipe
Construction
The Down-Pipe is constructed of 3" mandrel-bent 304 stainless steel tubing for unrestricted flow.

Combo
TIG-Welded: 
100% TIG-Welded by certified craftsmen for race proven strength and durability. TIG-Welding provides the strongest welds reducing stress cracks.

Hassle-Free Installation: 
For a hassle-free installation this kit includes nuts, bolts and a dipstick/tube for clearance.

Note: This is a "Race Only" product used solely for competition. Its use is limited to closed-course and open-course racing that is formally sanctioned by a recognized racing organization. Any other use including recreational off-road use could be in violation of local, state and federal laws.

Notes: Requires EGR delete race kit

All aFe exhaust systems are engineered and manufactured in our Corona, California manufacturing facility.