These engines cake on build up badly and you really need to walnut blast to actually blow out all the buildup. It is very drastic how much better the engine runs when cleaned well.
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11' m57 335d 165k Miles - JR 2, ATM Full Exhaust & Intake, Wagner FMIC, AAR Boost Pipe, AAR Swirl Delete, AAR EGR Delete
08' n54 135i FBO E85 - SOLD
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