Twin exhaust. Only one seems to be used?

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05-10-2008, 08:08 AM

spike

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My Ride: 2003, Passat W8 Station Wagon.

Another question. My 08 535xi has a twin exhaust; only the left side of the pair seems to get used as its black with soot and the right tube clean as a whistle. Is this normal as my BMW dealer said there is a flap that controls this function? I ask because as in the first few months both tubes were equally black. Thanks Stephen.

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05-10-2008, 09:31 AM

pukka

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My Ride: 2008 535i: (8/07 Build) Metallic Bronze, Beige NASCA Leather, Ventilated Seats, Sport Pkg, Cold Wxr Pkg, Logic-7 Sound, HUD, Night Vision, PDC, Split Rear Seats, NAV, Premium Pkg, Comfort Access, HD Radio, Sport Auto Trans Current mods: M-Aero Kit, JB4, Motorcepts 6000k HID Foglamps Umnitza ICE-Lite 10w LED 6000k AE's 1992 Camaro RS: Fully Restored w/Custom Interior, 5.0L V8, T-tops, OEM Z28 Foglamps, Inst Cluster, & Spoiler, Custom Sound, Too many engine mods to list

I have the same problem. SA said that when its cold the car shuts off one of the tailpipes to warm up faster. I've been driving in Germany the past winter so his story seemed to make sense.

I've been driving in GA for about a month and I still don't see any exhaust stains on the other tailpipe. I'll give it a bit longer but I'm probably gonna bring it up again the next time I pay the dealership a visit.

Note: The car has a single exhaust - just two tailpipes coming out of the muffler. And yes there is some sort of EGR valve looking device tubed in to the tailpipe.