Injen 8-Layer Oiled Cotton Gauze Air Filter/ Oval ID Oval Base/5.55in Media HT/7in x 2.75in Oval Top - X-1129-BR fits_2017-`BMW`5 Series The muffler's internal design and

The muffler's internal design and length was changed numerous times until our engineers found the perfect sound without sacrificing power output

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Injen 8-Layer Oiled Cotton Gauze Air Filter/ Oval ID Oval Base/5.55in Media HT/7in x 2.75in Oval Top - X-1129-BR fits_2017-`BMW`5 Series The muffler's internal design andWith a rich history in racing and the street performance, Injen Technology has proven itself as a leader in filtration engineering and technology. Lab tested and race proven, Injen's air filter line features state of the art designs and performance. All of Injen's 8 layer cotton gauze oiled air filters feature a tightly layered media that is specified for our use, along with a proprietary filter oil that includes highly advanced tackifiers to stop as