When Volvo developed its next generation of turbocharged five and six-cylinder engines, it partnered with BorgWarner to create a family of manifold-integrated turbochargers designed to deliver exceptional transient response, compact packaging, and OEM-level durability.
Rather than designing completely unrelated turbochargers for every engine, BorgWarner evolved a common integrated-manifold architecture across multiple applications, scaling airflow and turbine capacity to match each platform’s performance goals.
THE K04 FAMILY
BorgWarner K04-033.
This turbocharger was used on the Volvo P1 T5 platform, including:
• Volvo C30 T5
• Volvo S40 T5
• Volvo V50 T5
• Volvo C70 T5
The same K04-033 architecture was also utilized on Ford’s turbocharged 2.5L five-cylinder applications, including the Focus ST225.
THE RS500 & THE NEXT STEP
The Focus RS MK2 represented the ultimate factory evolution of the turbocharged Duratec/RNC-RS platform.
While the ST225 and P1 cars remained within the traditional K04 family, the RS305 and RS500 moved toward the larger BorgWarner K16 architecture, allowing substantially greater airflow and horsepower potential.
This larger-frame design would later become highly relevant to Volvo enthusiasts due to its connection to the SI6 T6 turbocharger family.
THE K16-2480
As Volvo transitioned to the SI6 3.0L inline-six engine used in the S80 T6, XC60 T6, XC70 T6, and later S60 T6 models, BorgWarner developed the K16-2480.
According to BorgWarner documentation, the K16-2480 was designed to support approximately 370 peak horsepower while maintaining the excellent transient response Volvo demanded from its turbocharged engines.
Applications included:
• Volvo S80 T6
• Volvo XC60 T6
• Volvo XC70 T6
• Volvo S60 T6
THE K16 CONNECTION
An interesting detail within the BorgWarner K16 family is the relationship between the 5316-998-0010 cartridge used in the Focus RS K16 applications and the 5316-998-0018 cartridge found in Volvo’s SI6 3.0 T6 turbocharger. While the T6 S16T utilizes a completely different integrated manifold and turbine housing assembly designed specifically for the six-cylinder engine, both turbochargers share the same core K16 architecture and many internal rotating assembly components. This common BorgWarner lineage is one of the reasons components and cartridge designs often cross-reference between RS and T6 applications.
Understanding these relationships helps explain why so many BorgWarner components interchange between applications and why modern hybrid turbo development can successfully combine parts from multiple BorgWarner platforms to create turbochargers that far exceed their original factory performance targets.
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