Very easy. Very good step by step guide. Or there are a few of us that could help out. I have jb4 on my 135i
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Injen Intake / JB4 / AR Design Catless Downpipes/ Matte Black Kidney Grilles / 15% Tint / VMR 710s / OEM CF License Plate Holder/Custom Painted Showline Black Diffuser/ BMW Performance CF Spoiler/ Eibach Pro Sport/ Koni Yellow
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