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I have an appointment this Wednesday to install some j-pipe (1/4 wave resonator) and from my research I will go with 36" long for my 535i and maybe ask for it to be ajustable in length to be able to tune it. Hopefully I will no longer have drone at highway speed
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BMW 535I xdrive 2011 M-Sport with H&R Springs, Niche Form Wheels 8.5 ET35 / 10.5 ET35, Continental DSW06 245/35 & 285/30, JB4 Map 5, ER Downpipe, Megan Racing Quad Exhaust with Vibrant resonators, M5 Diffuser, Orange reflector shaved and removed xdrive badge.
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