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The development of particulate-traps for big engines is more difficult than for automobile applications. The usual placement, after the turbocharger, necessitates complex solutions to challenges in size, flow distribution and regeneration. The placement of the particulate trap ahead of the turbocharger has technical and financial advantages, and has previously been extensively investigated, but did not prevail because of poor reliability of the monolithic traps. This paper investigates the knitted fiber trap, a mechanically and thermically dependable unit, developed for integration into the engine. A modular design makes the trap very compact. Filtration rate and pressure loss are satisfactory. The filter element has not shown any weakness. A typical deficiency of this application, that needs further investigation, is worsening of the engine's transient response by the thermal inertia of the filter material.