Nissan Patrol GU Y61 2001-2012 4.8L TB48DE Pacemaker Headers PH9550

Pacemaker PH9550 headers (extractors) with PH9550B base pipe are designed for the Nissan Patrol GU Y61 fitted with the 4.8L TB48DE petrol EFI inline-six engine. Pacemaker currently lists PH9550 for 2001-2012 models with manual or automatic transmission.

The PH9550 uses Pacemaker's Tri-Y design with 44mm (1¾") primary pipes, 51mm (2") secondary pipes and a 63mm (2½") outlet. The system is designed to improve exhaust flow, torque, throttle response and engine performance while retaining compatibility with the catalytic converter.

IMPORTANT – PH9550 will not fit vehicles fitted with a PTO winch.

Please check availability and current lead time before ordering.

Key Features

• Designed for Nissan Patrol GU Y61 4.8L TB48DE petrol EFI
• Tri-Y header design
• 44mm (1¾") primary pipes
• 51mm (2") secondary pipes
• 63mm (2½") outlet
• Manual and automatic transmission applications
• Power steering compatible
• Catalytic converter compatible
• Oxygen sensor provision
• PH9550B base pipe included with the PH9550/BASE kit

Construction

Pacemaker PH9550 uses a Tri-Y configuration with 44mm (1¾") primary pipes feeding into 51mm (2") secondary pipes and a 63mm (2½") outlet.

The standard headers are supplied in Pacemaker's distinctive protective blue finish.

Additional Options

Ceramic Coating: Ceramic coating options may be available for the header and base pipe to assist with heat management and corrosion resistance. Please contact Best Mufflers for current coating options and availability.

PHFG9550: Pacemaker specifies PHFG9550 as the replacement exhaust manifold/header gasket.

Vehicle Fitment

• Vehicle: Nissan Patrol
• Series: GU / Y61
• Years: 2001-2012
• Engine: TB48DE
• Capacity: 4759cc / 4.8L
• Configuration: Inline 6-cylinder petrol
• Cylinder Head: DOHC 24-valve
• Fuel System: Electronic fuel injection
• Drive: 4WD
• Transmission: Manual / Automatic

Header Specifications

• Part Number: PH9550
• Base Pipe: PH9550B
• Brand: Pacemaker
• Design: Tri-Y
• Primary Pipe: 44mm (1¾")
• Secondary Pipe: 51mm (2")
• Outlet: 63mm (2½")
• Power Steering: Yes
• Catalytic Converter: Yes
• Oxygen Sensor Provision: Yes
• EGR: N/A
• Replacement Gasket: PHFG9550
• Approximate Fitting Time: 1¾ hours

Fitment Notes

PTO Winch: Pacemaker specifically states that PH9550 will not fit vehicles fitted with a PTO winch.

Catalytic Converter: Pacemaker lists PH9550 as compatible with the catalytic converter. The PH9550B base pipe forms part of the header assembly and provides the downstream connection.

Oxygen Sensors: Pacemaker specifies oxygen sensor provision for this application. Ensure all required sensors are correctly installed when fitting the headers and base pipe.

Check engine mounts, steering, driveline and aftermarket accessories for adequate clearance during installation. Protect painted surfaces during trial fitting.

What's Included

• Pacemaker PH9550 header assembly
• Pacemaker PH9550B base pipe
• Connection gaskets and bolts supplied with the header/base-pipe assembly where included in the current Pacemaker kit

Contents can change between production batches. Please contact Best Mufflers if you need confirmation of the installation hardware supplied with the current kit.

Recommended With

• PHFG9550 exhaust manifold/header gasket
• Suitable downstream exhaust system to match the PH9550B base-pipe connection

Why Good Headers & Exhaust Systems Matter

At 4,000 rpm, the 4.8L TB48DE theoretically draws approximately 9,600 litres of intake air per minute at 100% volumetric efficiency and expels around 28,800 litres of hot exhaust gas per minute at approximately 600°C.

Actual airflow varies with RPM, engine load, volumetric efficiency, intake restriction, camshaft timing and engine condition. The figures above are theoretical values intended to illustrate the substantial volume of gas that must pass through the exhaust system at higher engine speeds.

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

Pacemaker lists an approximate fitting time of 1¾ hours. Actual installation time can vary depending on vehicle condition, accessories and previous exhaust modifications.

Before installation, confirm that the vehicle is not equipped with a PTO winch. Check oxygen sensor locations and all header, base-pipe, steering and driveline clearances before final tightening.

Professional installation is recommended.

Warranty & Compliance

Pacemaker headers are covered against manufacturing defects subject to Pacemaker's current warranty terms and conditions.

The vehicle's catalytic converter, oxygen sensors and other emissions-control equipment must remain correctly installed and operational where required. Check applicable state or territory requirements covering exhaust modifications, emissions and vehicle noise.

FAQ

What vehicles do PH9550 headers suit?
Pacemaker currently lists PH9550 for Nissan Patrol GU Y61 4.8L petrol EFI models from 2001-2012 with manual or automatic transmission.

What engine does PH9550 suit?
PH9550 suits the 4.8L TB48DE petrol EFI inline-six used in the GU Y61 Patrol.

Are PH9550 headers Tri-Y?
Yes. Pacemaker specifies a Tri-Y design.

What size are PH9550 headers?
Pacemaker specifies 44mm (1¾") primary pipes, 51mm (2") secondary pipes and a 63mm (2½") outlet.

Does the kit include the base pipe?
The PH9550/BASE package includes the PH9550 header and PH9550B base pipe.

Will PH9550 fit a Patrol with a PTO winch?
No. Pacemaker specifically states that PH9550 will not fit with a PTO winch.

Does PH9550 suit manual and automatic Patrols?
Yes. Pacemaker lists both manual and automatic transmission applications.

Does PH9550 have oxygen sensor provision?
Yes. Pacemaker specifies oxygen sensor provision for PH9550.

What gasket suits PH9550?
Pacemaker specifies PHFG9550.

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.

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