Pacemaker Headers PH2634 – Chrysler 300C 5.7 / SRT8 6.1 / 6.4 HEMI V8 2005–2025

Pacemaker PH2634 headers (extractors) are performance headers designed for Chrysler 300C 5.7L HEMI V8 and 300C SRT8 6.1L / 6.4L HEMI V8 models. Their performance-oriented design and large-diameter pipework provide increased exhaust flow capacity for both standard and modified HEMI engines.

Featuring mandrel-bent 48mm primary pipes and large 76mm flanged outlets, PH2634 headers help improve exhaust gas flow and scavenging, increasing usable torque, sharpening throttle response and improving overall engine performance. They are an excellent upgrade for street performance vehicles, weekend cruisers and modified HEMI V8 applications.

A matching Pacemaker performance exhaust system is also available separately for customers wanting to upgrade the complete exhaust system.

Key Features

• Vehicle-specific design for Chrysler 300C HEMI V8 applications
• Mandrel-bent 48mm primary pipes
• Large 76mm flanged outlets
• Mandrel-bent pipework maintains consistent internal diameter through bends for improved exhaust flow
• Thick machined flanges for reliable sealing and durability
• Smooth collectors designed to improve exhaust scavenging and gas flow
• Designed to improve torque, throttle response and overall engine performance
• Can be combined with the matching Pacemaker performance exhaust system

Vehicle Fitment

• Chrysler 300C 5.7L EZB HEMI V8 – 16V OHC – 250kW – 2005 to 2012
• Chrysler 300C SRT8 6.1L EZF HEMI V8 – 16V OHC – 317kW – 2006 to 2012
• Chrysler 300C SRT8 6.4L EZG HEMI V8 – 16V OHC – 350kW – 2012 to 2025

Construction

• High-quality steel tubing for strength and long service life
• Mandrel-bent pipework for consistent exhaust flow
• Precision welded construction for strength and accurate fitment
• Finished in Pacemaker Blue heat-resistant coating rated to approximately 800°C
• Australian manufactured Pacemaker performance headers

Additional Options

• Ceramic Coating: Available separately under product code "PHC40" for improved heat management and corrosion resistance
• Exhaust Gaskets: Reuse original exhaust manifold gaskets where serviceable
• Oxygen Sensor Extensions: PEX2662 x 4 required

Fitment Notes

• Oxygen sensor wiring extensions PEX2662 x 4 are required for installation.
• Designed for the Chrysler 300C HEMI V8 engine applications listed above.
• Reuse the original exhaust manifold gaskets where they remain in suitable serviceable condition.
• A complete matching Pacemaker performance exhaust system is available separately.
• Connection or fabrication may be required when connecting the headers to exhaust systems other than the matching Pacemaker system.
• Protect painted surfaces and wrap the headers during trial fitting to prevent damage to the coating.
• Check oxygen sensor wiring and ensure it is routed away from hot header pipework.
• Check starter motor, steering, wiring, hoses and surrounding component clearance during installation.
• Clearance may vary where non-original engine mounts, steering components or aftermarket parts have been fitted.
• Verify emissions and registration compliance in your state before installation.
• Professional installation is recommended.

What’s Included

• 1 x Pacemaker PH2634L left-hand header assembly
• 1 x Pacemaker PH2634R right-hand header assembly
• Outlet flanges for connection to the exhaust system

Recommended With

• PEX2662 Oxygen Sensor Wiring Extensions x 4 – required for installation
• Matching Pacemaker performance exhaust system – available separately
• Original exhaust manifold gaskets – reuse where serviceable

Why Good Headers & Exhaust Systems Matter

• At 5,000 rpm, the 6.4L HEMI V8 draws in approximately 16,000 litres of intake air per minute and expels around 48,000 litres of exhaust gas per minute at approximately 600°C.

Warranty & Compliance

• Backed by Pacemaker's 2-year manufacturer warranty
• Warranty applies according to Pacemaker's current manufacturer terms and conditions
• Verify emissions and registration compliance in your state.
• Modification of factory exhaust components may affect vehicle emissions compliance.
• Installation should provide adequate clearance from wiring, hoses and other heat-sensitive components.

Frequently Asked Questions

What Chrysler 300C engines do PH2634 headers suit?
Pacemaker PH2634 headers are designed for the Chrysler 300C 5.7L HEMI V8 and 300C SRT8 6.1L and 6.4L HEMI V8 applications listed above.

Do I need oxygen sensor extensions?
Yes. Installation requires four PEX2662 oxygen sensor wiring extensions. These allow the oxygen sensor wiring to reach the new sensor positions created by the header installation.

Are new exhaust manifold gaskets required?
Pacemaker specifies reuse of the original exhaust manifold gaskets where they remain in good serviceable condition. Inspect the original gaskets carefully during installation and replace them if damaged or unsuitable for reuse.

Can I connect these headers to the factory exhaust?
The PH2634 headers include outlet flanges for connection to the exhaust system. Depending on the exhaust configuration fitted to the vehicle, connection or fabrication work may be required.

Is a matching Pacemaker exhaust system available?
Yes. A matching Pacemaker performance exhaust system is available separately. Contact us with your vehicle details for the correct system.

Can these headers be ceramic coated?
Yes. Ceramic coating is available separately under product code PHC40 for improved heat management, appearance and corrosion resistance.

Can I pick up from the store?
Yes. Pick up is available but must be pre-arranged before collection.

How much is freight?
Freight varies depending on your delivery location and where stock is available. Please contact us for freight charges before ordering. Where possible, we can arrange dispatch from the nearest available product location to help reduce freight costs and delivery times.

Do you ship to the USA?
Yes. Best Mufflers regularly ships exhaust systems and exhaust parts to customers throughout the United States.

Please note that import duties, tariffs, taxes, and customs clearance fees are not included in the product or shipping price. Once your order is processed and the applicable charges are calculated, we will send you a secure payment link to finalise the import duties and tariff charges before dispatch.

Customer Support

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