Stainless Steel Headers For Chevy Cobalt/HHR (2005-2010) with 2.2/2.4 Engine

Wake up your Ecotec and get the throttle response the GM Delta platform was missing from the factory with this high-flow stainless steel header upgrade.

Performance Stainless Steel Header for Chevrolet Cobalt & HHR (2.2L / 2.4L Ecotec)

If you drive a Chevrolet Cobalt or HHR equipped with the naturally aspirated 2.2L or 2.4L Ecotec, you know these engines are reliable, but they feel choked at higher RPMs. The factory exhaust manifold is a cast "log" design that prioritizes low manufacturing costs over performance. It forces exhaust pulses to collide, creating backpressure that robs your engine of horsepower and torque. This "Racing Spec" header replaces that restrictive cast iron slab with free-flowing T304 stainless steel tubing, optimized specifically for the 2.2L and 2.4L displacement.

By using a 4-into-1 design with smooth mandrel bends, this header scavenges exhaust gases much more efficiently than stock. This scavenging effect pulls spent gases out of the combustion chamber faster, allowing a fresh air/fuel mixture to enter more readily. The result is a noticeable bump in mid-range torque and top-end pull—exactly where the Ecotec DOHC architecture likes to play. You’ll also get a deeper, more aggressive exhaust note that hints at the performance potential hiding in your daily driver.

Important Fitment Note: The GM Ecotec engine went through several variations. This header is designed for cylinder heads WITHOUT an EGR (Exhaust Gas Recirculation) port. Please visually inspect your factory manifold to ensure no EGR tube is connected prior to installation.

Why You Need This Upgrade

• Proven Performance: Engineered to deliver instant gains of 10-15 horsepower and torque by uncorking the exhaust flow.
• Optimized Geometry: Tubing diameter and length are specifically tuned for the 2.2L and 2.4L non-turbo engines to maximize scavenging.
• Racing Spec Collector: Features a large 3.25" outlet (allowable error range: 0.1-0.2 inch) to ensure zero restriction at the collector point.
• Durability & Style: Constructed from T304 stainless steel to resist corrosion and add a professional, polished look to your engine bay.
• Precision Flange: Includes 1.625" x 0.875" oval ports to match the cylinder head exhaust ports for smooth transition.

Installation Notes

This is a direct bolt-on installation for vehicles without the EGR port. Professional installation is highly recommended as space can be tight in FWD engine bays. The kit includes the necessary metal gasket for a leak-free seal. Note that this header is strictly for Non-Turbo/Non-Supercharged models (excludes the 2.0L LSJ/LNF engines) and fits the naturally aspirated 2.2L and 2.4L variants only.

Replaces These OEM Applications

• For Chevrolet Cobalt Base 2.2L 2005
• For Chevrolet Cobalt LS 2.2L 2005-2010
• For Chevrolet Cobalt LT 2.2L 2005-2010
• For Chevrolet Cobalt LTZ 2.2L 2006-2007
• For Chevrolet Cobalt SS 2.0L 2005-2010
• For Chevrolet Cobalt SS 2.4L 2006-2007
• For Chevrolet Cobalt Sport 2.4L 2008
• For Chevrolet HHR LS 2.2L 2006-2010
• For Chevrolet HHR LT 2.2L 2006-2010
• For Chevrolet HHR LT 2.4L 2006-2010

Eliminate the bottleneck in your Ecotec's performance and enjoy a smoother, more powerful drive—order your Stainless Steel Header today.

Common Questions

Will this header fit my 2005-2010 Chevy Cobalt or 2006-2010 HHR?
Yes, it is a direct bolt-on fit for 2005-2010 Chevrolet Cobalt and 2006-2010 Chevrolet HHR models equipped with the naturally aspirated 2.2L or 2.4L Ecotec engine without an exhaust manifold EGR port.

Does this fit a Cobalt SS?
It fits the naturally aspirated 2006-2007 Cobalt SS 2.4L and 2008 Cobalt Sport 2.4L. It is built specifically for non-turbo and non-supercharged 2.2L and 2.4L engines rather than the 2.0L LSJ or LNF models.

How do I check if my Ecotec engine has an EGR port before ordering?
Visually inspect your factory exhaust manifold before installation to confirm there is no EGR (Exhaust Gas Recirculation) tube connected to it, as this header is built for cylinder heads without an EGR port.

What are the port and collector dimensions on this header?
It features a 4-into-1 mandrel-bent T304 stainless steel design with 1.625" x 0.875" oval inlet ports and a 3.25" collector outlet.

What is included in the box and what gains can I expect?
The kit includes the polished T304 stainless steel header and a metal flange gasket for a leak-free seal. By replacing the restrictive cast iron log manifold, it is engineered to add 10-15 horsepower and torque.