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      09-30-2017, 09:28 AM   #7
roundel335
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Drives: 13 335i Sedan, 16 228i Cabrio
Join Date: Apr 2010
Location: Leland, NC

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Don't waste your money on a "cold air intake", as the stock system is just that. Instead, buy a freer-flowing drop-in filter to replace the stock paper filter, such as those from AFE or K&N. As for the downpipe, it will give you a little more noise, but it's the turbo itself that muffles the exhaust, so the downpipe is more for power than sound.

Also, your engine is an inline six, and it will never have the same type of rumble of a 90-degree V8 due to the number of cylinders and the firing order. What you have now sounds good.
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2013 F30 335i M-Sport 8AT/MPE/MPPK, 2016 228i M-Sport Cabrio 8AT