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That is impressive sound I would look IMO to remove the mid section as well. Not sure on e92 but on e90 just after the mid box there is a pinch point. On mine removed the lot from cat/dpf there is a straight pipe to new custom back box. Sounds very nice as well not as deep as yours but with two small kids need it to be bit more quieter
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F30 335i M Sport - now departed
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