Chrysler 300C 5.7L 6.1L 6.4L HEMI V8 Hurricane Exhaust Headers HU523STM

Hurricane HU523STM exhaust headers (extractors) are designed for selected Chrysler 300C models fitted with 5.7L, 6.1L or 6.4L HEMI V8 engines.

Featuring mandrel-bent 1.78" (approximately 45mm) primary pipes with large 3.00" (76mm) outlets, HU523STM headers replace the restrictive factory exhaust manifolds and are designed to improve exhaust gas flow for better torque, throttle response and engine performance.

Please check availability and current lead time before ordering.

Key Features

• Designed for selected Chrysler 300C HEMI V8 applications
• Listed for 5.7L, 6.1L & 6.4L HEMI V8 engines
• Mandrel-bent 1.78" (approximately 45mm) primary pipes
• Large 3.00" (76mm) outlets
• Australian made Hurricane performance headers
• Designed to improve exhaust flow, torque, throttle response and engine performance
• High-flow catalytic converters available separately

Construction

• Quality steel construction
• Mandrel-bent primary pipes for consistent exhaust gas flow
• Quality welded construction for strength and durability
• Hurricane heat-resistant painted finish
• Australian made

Additional Options

• High-Flow Catalytic Converters: Available separately – contact Best Mufflers for the correct converters for your vehicle
• Matching performance exhaust components may be available separately

Vehicle Fitment

• Make: Chrysler
• Model: 300C / 300
• Engine Options: 5.7L / 6.1L / 6.4L HEMI V8
• 5.7L HEMI: Australian 300C applications from 2005
• 6.1L HEMI SRT8: Australian 300C applications from 2006 through 2011
• 6.4L HEMI SRT8: Later-generation Australian Chrysler 300 SRT8 applications from 2012

Fitment warning: The engines listed above span different Chrysler 300/300C generations. Confirm HU523STM compatibility with your exact vehicle before ordering.

Header Specifications

• Part Number: HU523STM
• Primary Pipe Size: 1.78" / approximately 48mm
• Outlet Size: 3.00" / 76mm
• Construction: Mandrel-bent steel
• Gaskets: Reuse original exhaust manifold gaskets where serviceable

Fitment Notes

• Listed for selected 5.7L, 6.1L and 6.4L HEMI V8 Chrysler 300C/300 applications
• Please confirm exact vehicle year, model and engine before ordering
• The 6.4L HEMI was introduced in the later-generation Chrysler 300 SRT8
• Original exhaust manifold gaskets may be reused where they remain in good serviceable condition
• Inspect all original gaskets before installation and replace damaged or deteriorated components
• High-flow catalytic converters are available separately
• Protect painted surfaces during trial fitting and installation
• Clearance may vary where aftermarket engine, transmission or exhaust components have been fitted
• Please check availability and current lead time before ordering.

What’s Included

• Hurricane HU523STM left and right header assemblies

Recommended With

• Replacement exhaust manifold gaskets where the original gaskets are not suitable for reuse
• High-flow catalytic converters suitable for the specific vehicle application
• Matching performance exhaust system or intermediate pipes

Why Good Headers & Exhaust Systems Matter

At 4,000 rpm, a 5.7L HEMI V8 theoretically draws in approximately 11,400 litres of intake air per minute and can expel around 34,200 litres of hot exhaust gas per minute at approximately 600°C.

At the same engine speed, a 6.1L HEMI V8 theoretically draws in approximately 12,200 litres of intake air per minute and can expel around 36,600 litres of hot exhaust gas per minute at approximately 600°C, while a 6.4L HEMI V8 theoretically draws approximately 12,800 litres per minute and can expel around 38,400 litres per minute of hot exhaust gas.

A well-designed header and exhaust system helps manage this high gas flow efficiently, reducing restriction and improving exhaust scavenging, torque, throttle response and engine performance.

Installation Tips

• Apply penetrating lubricant to exhaust manifold fasteners and exhaust connections before removal
• Inspect the original exhaust manifold gaskets carefully
• Original gaskets may be reused where they remain in good serviceable condition
• Replace damaged, compressed or deteriorated gaskets
• Trial-fit both headers before fully tightening the mounting hardware
• Check steering, engine mounts, starter motor, wiring and surrounding components for adequate clearance
• Check oxygen sensor wiring and catalytic converter connections during installation
• Check all exhaust connections for leaks after installation

Warranty & Compliance

Hurricane headers are covered by the applicable manufacturer's warranty, subject to Hurricane's current warranty terms and conditions.

The completed exhaust system must retain all catalytic converters, oxygen sensors and emissions-control equipment required for the vehicle and comply with applicable state or territory emissions, roadworthiness and registration requirements.

FAQ

Which Chrysler 300C engines are HU523STM headers listed for?
HU523STM is listed for selected Chrysler 300C/300 applications fitted with 5.7L, 6.1L and 6.4L HEMI V8 engines.

What years do HU523STM headers fit?
The listed HEMI engines span different Chrysler 300/300C generations. Australian 5.7L models date from 2005, the 6.1L SRT8 arrived in 2006, and the 6.4L SRT8 belongs to the later generation from 2012.

What size are the HU523STM header pipes?
HU523STM uses 1.78" (approximately 45mm) primary pipes with 3.00" (76mm) outlets.

Are exhaust manifold gaskets included?
The original application information specifies reuse of the original gaskets. Inspect the gaskets before installation and replace them if damaged or no longer serviceable.

Are high-flow catalytic converters available?
Yes. High-flow catalytic converters are available separately. Please contact us with your vehicle year and engine so the correct components can be confirmed.

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

For phone orders, advice, or part enquiries – contact us: