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Flash tune. BEF if you wanna keep the JB4, otherwise, sell the piggyback and just roll with MHD, BM3, or Active Autowerke. All have burble tunes to increase overrun.
Downpipe is the best mod IMO both for power and sound gains. If you're worried about smog, look into a HFC DP.
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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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