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BMW 3-Series (E90 E92) Forum
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Downpipe Help
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| 06-30-2013, 05:30 AM | #1 |
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Banned
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Downpipe Help
Hey guys, i installed the downpipes 3 inch catless vrsf on my n54, and when i drive, white smoke comes out of my exhaust. I have 135i full straight pipe quad exhaust. Does this problem have anything to do with my o2 sensors? Also, with my downpipes on my check engine light came on and the car will go crazy. Anyone with similiar problems? Thanks in advance.
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| 06-30-2013, 08:27 AM | #3 |
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Captain
 
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Drives: BMW X3 35i, Porsche Macan S
Join Date: Jul 2012
Location: Scottsdale AZ
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So you are completely catless now? Unfortunately smoke and smell are side effects of catless exhaust. CEL is result of downpipes - you need DP fix or tune with auto clear feature to get rid of it.
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MOTIV 750 ST | MOTIV PI | 100% E85 | Fuel-it Stage 4 LPFP | MOTIV Boost Box + MHD Protune | Quaife | Öhlins | Brembo | Akrapovic
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| 06-30-2013, 10:06 AM | #4 |
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Lieutenant
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If you removed your secondary cats and have catless downpipes, you'll smoke. Sound will probably be a bit raspy too, but that's my opinion. No way around some smoke of you are fully catless
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2009 E92 335i M-Sport - MHD Stage One - BMW Performance Exhaust - BMS Oil Catch Can - CDV Delete - K&N Panel Filter - Arc Angel H8 bulbs - Gloss Black Kidney Grills - Painted Reflectors - VRSF Charge Pipe
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