(N47 328d) Can I Build A Twin-Exit Rear Exhaust Without Modifying DEF?

pashad13 · 01-18-2024, 06:21 PM

I have a 2015 328d m sport wagon. Ordered an AK style twin exit diffuser, and therefore want to have an exhaust shop build me a custom rear end that is a straight pipe to a twin-exit.

I haven't lifted the car up as I've only bought it a few months ago -- does the DEF connect to the midpipe section or the muffler section? Is it possible to have an exhaust like this built without needing to modify the DEF portion?

Thanks all.

n00bkiller944 · 01-19-2024, 01:12 PM

Should be able to without modifying the DEF feed, however, if I remember correctly the DEF tank sits where your second pipe would exit

dannyhu · 01-19-2024, 09:59 PM

You will not be able to make it a function dual exhaust without removing the DEF tank.

01-18-2024, 06:21 PM	#1
pashad13 Pasha Dastmalchi 62 Rep 111 Posts Drives: 2019 M240i Coupe 8 Spd Auto Join Date: May 2019 Location: Laguna Beach, California iTrader: (0)	(N47 328d) Can I Build A Twin-Exit Rear Exhaust Without Modifying DEF? I have a 2015 328d m sport wagon. Ordered an AK style twin exit diffuser, and therefore want to have an exhaust shop build me a custom rear end that is a straight pipe to a twin-exit. I haven't lifted the car up as I've only bought it a few months ago -- does the DEF connect to the midpipe section or the muffler section? Is it possible to have an exhaust like this built without needing to modify the DEF portion? Thanks all. __________________ Owned: 2019 Alpine White M240i Coupe \| VRSF Catless DP \| AP Intake \| BM3 Stage 2 (Blown at 21k miles) Own: 2015 Black Saphire Metallic 328d Touring M-Sport
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01-19-2024, 01:12 PM	#2
n00bkiller944 Lieutenant 126 Rep 424 Posts Drives: '14 328d M Sport Join Date: Mar 2018 Location: Richmond, VA iTrader: (0)	Should be able to without modifying the DEF feed, however, if I remember correctly the DEF tank sits where your second pipe would exit
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01-19-2024, 09:59 PM	#3
dannyhu Registered 0 Rep 4 Posts Drives: white ac e90 Join Date: May 2007 Location: huntington beach iTrader: (0)	You will not be able to make it a function dual exhaust without removing the DEF tank.
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