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If you want more exhaust sound, get a mid-pipe... I'm thinking of eventually getting one for my car with the stock exhaust. There are some videos around of 340i with mid-pipe only. Cat-back isn't really worth the cost IMO.
Since you have a JB4, I've read a down pipe will help with performance a bit. Not sure if it'll be too much louder with a stock exhaust but you might hear more of the turbo.
Decide based on what you want.
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2016 Estoril Blue II 340i M Sport | ///MPPSK | 6MT | RWD | Fully Loaded
BM3 Stage 2+ 93 | B58TU HPFP | VRSF v2 Catted Downpipe | 550i Clutch
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