CSF All-Aluminium Radiator for Ford Mustang GT 5.0 V8 & Bullitt (S550) CSF-7073

The CSF-7073 is an upgraded all-aluminium radiator designed for the Ford Mustang S550 GT 5.0-litre V8 and Bullitt.

Its primary purpose is to improve engine coolant heat rejection and maintain more consistent operating temperatures, particularly during demanding driving conditions.

The important distinction: this is a cooling-system upgrade, not a horsepower upgrade. It helps the engine maintain the thermal conditions needed for consistent performance.

1. Engineering: How CSF makes it more efficient

The key technology is CSF’s B-Tube design.

Unlike conventional oval-shaped radiator tubes, CSF forms its tubes into a B-shaped profile and brazes the seam.

This provides:

• Approximately 15% more heat-transfer surface area compared with conventional O-tubes.
• Improved coolant-to-aluminium heat-transfer contact.
• Stronger tube construction.
• Better utilisation of the available radiator core space.

The radiator also uses multi-louvred cooling fins to improve heat exchange as air passes through the core. 

2. Technical specifications

Specification	CSF-7073
Construction	All aluminium
Core design	2-row
Core thickness	42 mm
Fin height	6.5 mm
Technology	B-Tube
Radiator flow	Cross-flow
Inlet/outlet	CNC-machined connections
Drain plug	Aluminium
Finish	Satin
Installation	OEM-style drop-in

Source: CSF manufacturer specifications. 

3. What benefits does it deliver?

A. Better thermal management

Helps reject engine heat and maintain more stable coolant temperatures during sustained engine loads.

B. High-output engine preparation

Useful supporting hardware for modified Coyote V8 engines, including builds producing additional heat.

C. OEM component compatibility

Designed to retain the original fan shroud, A/C condenser, mounting brackets and compatible coolant hoses.

D. Aluminium construction

Aluminium tanks and core provide a lightweight, integrated construction suitable for performance applications.

4. Advantages vs disadvantages

Advantages	Considerations
Efficient B-Tube technology	Higher purchase cost than a standard replacement
All-aluminium construction	Requires proper installation
42 mm dual-row core	Does not guarantee lower temperatures in every condition
OEM-style connections	Radiator cap not included
Suitable for street and track applications	Does not replace engine oil cooling
Supports higher-output builds	Does not directly increase horsepower

5. Vehicle compatibility

CSF lists the following applications:

• Mustang GT 5.0 V8: 2015–2021.
• Mustang Bullitt 5.0 V8: 2019–2020.
• Shelby GT350 5.2 V8: 2015–2020.
• Selected 2015–2017 Mustang 3.7 V6 applications.

Important: CSF-7073 is not the radiator for the 2.3 EcoBoost; that application uses a different part number, CSF-7072. Verify exact vehicle year and configuration before purchase.

6. Technical verdict

Strong performance cooling upgrade

The CSF-7073 makes sense for Mustang owners who want improved radiator capability without converting to a heavily customised cooling arrangement.

Its biggest selling points are:

• B-Tube heat-transfer technology.
• 42 mm two-row aluminium core.
• OEM-style drop-in installation.
• Compatibility with performance-oriented applications.

One important engineering point: radiator performance also depends on airflow, fan operation, coolant circulation, thermostat function and the condition of the rest of the cooling system.

Conclusion: This is a sensible supporting modification for a naturally aspirated or modified 5.0 Coyote V8, particularly when the original cooling system is struggling under sustained load. It is not automatically necessary for every standard road-going Mustang.

CSF All-Aluminium Radiator for Ford Mustang GT 5.0 V8 & Bullitt (S550) CSF-7073

Milltek Exhaust System for Toyota GR Yaris (Gen 2) SSXTY243

The Milltek Sport SSXTY243 is a GPF/OPF-back performance exhaust designed for the 2024-onwards Toyota GR Yaris Gen 2.

Its main engineering feature is an electronically controlled exhaust valve that changes the exhaust flow and sound character according to vehicle speed and engine RPM.

1. Technical specifications

Specification	Details
Manufacturer	Milltek Sport
Part number	SSXTY243
Vehicle	Toyota GR Yaris Gen 2
Engine	G16E-GTS 1.6L Turbo
Application	2024 onwards, GPF/OPF models
Exhaust diameter	76.2 mm (3 inches)
Construction	Stainless steel
Configuration	GPF-back
Exhaust valve	Electronic CANBUS
Exhaust tips	2 × 115 mm GT polished
Homologation	ECE marked
Race system	No

2. Understanding its engineering

The SSXTY243 consists of five major components:

Component	Function
MSTY145REP	Centre silencer bypass
MSVCTRL15	CANBUS valve control module
MSTY177	Valved rear silencer
MSTY178	Left-side outlet pipe
MSTY179	Right-side valved outlet pipe

The interesting part is the valve technology.

Milltek uses vehicle CANBUS data to determine when the exhaust valve opens or closes.

• Normal cruising: valve remains closed.
• Above approximately 80 km/h: valve opens.
• Above approximately 4,500 RPM: valve opens.

When open, the exhaust takes a less-restricted route through the rear silencer arrangement, creating a more pronounced exhaust sound.

3. Why the 3-inch diameter matters

A 76.2 mm exhaust pipe offers substantial flow capacity.

Potential engineering benefits:

• Reduced restriction in the exhaust section being replaced.
• Better flow capacity under higher exhaust mass-flow conditions.
• Greater flexibility for future engine upgrades.
• More distinctive exhaust acoustics.

However, bigger piping does not automatically produce more horsepower.

Actual power gains depend on turbocharger characteristics, backpressure, exhaust temperature, engine calibration and the original exhaust configuration.

4. Advantages and disadvantages

Advantages	Disadvantages
ECE-marked system	Premium aftermarket pricing
Electronic exhaust valve	No standard manual valve control
3-inch piping	Does not replace the downpipe
Polished 115 mm tips	Larger tips may not suit everyone’s taste
Vehicle-specific Gen 2 fitment	Requires correct GPF/OPF compatibility
Retains factory particulate filter	Power gains are not guaranteed

Important: The standard SSXTY243 valve cannot be manually opened or closed on demand. Milltek identifies optional supporting controllers, but adding manual override removes its ECE approval status.

5. Technical verdict

Sound engineering- Strong concept

Flow capacity- 3-inch

Daily usability- Good design

Power improvement- Not quantified

The SSXTY243 is primarily a sound-character and exhaust-flow upgrade rather than a guaranteed horsepower modification.

Its most attractive engineering feature is the combination of a centre silencer bypass, valved rear silencer and CANBUS-controlled operation.

For a Gen 2 GR Yaris owner, the important consideration is whether the priority is sound refinement, exhaust flow or measurable engine performance.

Milltek Exhaust System for Toyota GR Yaris (Gen 2) SSXTY243