When it comes to extracting serious horsepower from your Pontiac G8, few upgrades deliver the performance, sound, and quality of a properly engineered long-tube header system.

The American Racing Headers Long System is designed specifically for the 2008–2009 Pontiac G8 GT and GXP, providing a high-performance exhaust solution that combines exceptional craftsmanship, optimized exhaust flow, and outstanding fitment.

Whether you’re looking to wake up your factory L76 or LS3 engine or building a more aggressive naturally aspirated or supercharged combination, ARH delivers the exhaust performance needed to support your build.

Proven Horsepower & Torque Gains

American Racing Headers developed its G8 system to deliver measurable improvements in horsepower and torque by reducing exhaust restriction and improving exhaust gas evacuation.

During testing on a Mustang chassis dynamometer, the ARH G8 system demonstrated gains of:

• +38 Rear-Wheel Horsepower
• +41 Rear-Wheel Torque

These gains were recorded before additional tuning or cold air intake upgrades, demonstrating the potential performance improvement available from a properly engineered exhaust system.

Actual results will vary depending on engine configuration, supporting modifications, tuning, and testing conditions.

Premium 304 Stainless Steel Construction

Like every American Racing Headers system, the G8 Long System is 100% manufactured in the USA using high-quality materials and precision fabrication techniques.

The headers are constructed from durable 304 stainless steel, providing excellent corrosion resistance and long-term durability.

Heavy-duty 3/8″ thick laser-cut stainless steel flanges provide a strong, stable mounting surface designed to resist warping and maintain a reliable seal against the cylinder heads.

Each header also features hand-ported, TIG-welded inlets to help promote smooth exhaust flow from the cylinder head into the primary tubes.

High-Performance Merge Collectors

The ARH Long System utilizes precision-engineered merge collectors with integrated scavenger spikes.

Unlike basic collectors that simply combine exhaust tubes, merge collectors are designed to promote smoother exhaust gas transitions and improve scavenging efficiency.

The scavenger spikes further help manage exhaust flow as individual primary tubes converge into the collector.

Together, these features help improve exhaust evacuation, reduce unnecessary restriction, and support stronger engine performance throughout the RPM range.

Choose Your Primary Tube Size

The American Racing Headers G8 Long System is available in two primary tube configurations:

1-7/8″ Primary Tubes

A popular option for more aggressively modified combinations, including larger camshafts, upgraded cylinder heads, increased displacement, and forced induction applications where additional exhaust flow capacity may be beneficial.

Both configurations feature ARH’s optimized tube routing, merge collectors, and premium stainless steel construction.

High-Flow Catalytic Converter Options

Catted ARH systems feature severe-duty 300-cell catalytic converters, designed to provide high-flow exhaust performance for demanding applications.

For customers seeking an upgraded catalytic converter option, ARH also offers 400-cell G-Sport catalytic converters.

Please contact us before ordering if you would like to upgrade to the G-Sport catalytic converters.

Designed Specifically for the Pontiac G8

Fitment is just as important as performance.

Rather than adapting a universal header system, American Racing Headers engineered its Long System specifically around the Pontiac G8 chassis.

Optimized primary tube routing provides excellent clearance and fitment while simplifying installation.

The system is designed to connect directly to your existing factory or aftermarket axle-back exhaust, allowing you to retain your preferred rear muffler setup.

Whether you’re building a naturally aspirated street/strip G8 GT, a cammed GXP, or a high-horsepower performance project, the American Racing Headers Long System delivers the construction quality and exhaust flow needed to take your combination further.