PSA Group fitting gasoline particulate filters on all GDI engines from December 2017 - Green Car Congress
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Evaluating the filtration efficiency of close-coupled catalyzed gasoline particulate filter (cGPF) over the WLTC and simulated RDE cycles - ScienceDirect
Milltek Particulate Filter-back - Porsche Cayman 718 GT4 4.0 (OPF/GPF – PSR Parts
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New Volkswagens to feature Gasoline Particulate filters from 2017 onwards
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Ultimate Underhood - Gasoline Particulate Filters
GPF / PPF Removal Delete FAQ - Is it illegal? - Hypermiler.co.uk