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Downpipe will not only give you more sound, but give you power gains as well. That's my recommendation. Then, if you think it's still not loud enough, go midpipe or res delete. But be forewarned, a lot of people have said downpipe plus full catback/res delete results in drone.
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2013 F30 335i RWD ZF Melbourne Red
~Remus Sport Axleback~VRSF Chargepipe~VRSF Catless Downpipe~GPlus FMIC~HR Sport Springs~Active Autowerke OBD Flash Tune Stage 2~
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