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Aftermarket bling for diesel engines: Tenneco diesel particulate filter

Tenneco, headquartered in Lake Forrest, Illinois, was chosen by Toyota as the exclusive supplier of retrofit diesel particulate filters for original equipment service applications for the complete Toyota diesel car range. The DPF production started last month in Poland, after an accelerated six month engineering and product development process. While original equipment diesel particulate filters work in a closed loop system, with periodic regeneration to burn off the soot collected on the filter, the DPF for service applications work in open loop. The open loop operation, where there is no communication between the filter and the engine management system, is made possible by the design and coating of the filter, which support continuous regeneration.
[Source: Tenneco Automotive]

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