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Baronie75 · 03-14-2017, 06:51 PM

Found this piggybacked into my engine ecm harness.... not really sure what it is. I wasn't brave enough to turn the dial, if anyone could help me figure out what this is it would be appreciated.

kisarci · 03-14-2017, 06:58 PM

Looks like a downpipe fix. do you have catless dp's?

Baronie75 · 03-14-2017, 06:59 PM

I'm not really sure, its not super loud. Never had it up on a rack. I'll have to investigate that.

Baronie75 · 03-14-2017, 07:01 PM

Why would it have a dial you could adjust though.. I thought it maybe had something to do with fuel pressure or maybe a boost fooler. I'm a diesel head, this is the first forced induction gasser i've had.

limitdown · 03-14-2017, 09:37 PM

It's a DP fix. The previous owner put it in to pass emissions. It needs to be dialed in to work correctly. For everyday driving, it must be removed, or over time it'll mess up your O2 sensor/AFR adaptations.
It's possible he uninstalled and sold the catless downpipes to somebody else before selling this car, so you'll either need to scan with MHD (check the main MHD thread on the first page) or get it on a lift and visually check.

03-14-2017, 06:51 PM	#1
Baronie75 Registered 0 Rep 3 Posts Drives: 2009 335i Sedan Join Date: Mar 2017 Location: Pittsburgh, PA iTrader: (0)	Help Found this piggybacked into my engine ecm harness.... not really sure what it is. I wasn't brave enough to turn the dial, if anyone could help me figure out what this is it would be appreciated. Attached Images
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03-14-2017, 06:58 PM	#2
kisarci Lieutenant 64 Rep 421 Posts Drives: 2007 335i Join Date: Dec 2014 Location: Long Island, NY iTrader: (0)	Looks like a downpipe fix. do you have catless dp's? __________________ 07 335i e92
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03-14-2017, 06:59 PM	#3
Baronie75 Registered 0 Rep 3 Posts Drives: 2009 335i Sedan Join Date: Mar 2017 Location: Pittsburgh, PA iTrader: (0)	I'm not really sure, its not super loud. Never had it up on a rack. I'll have to investigate that.
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03-14-2017, 07:01 PM	#4
Baronie75 Registered 0 Rep 3 Posts Drives: 2009 335i Sedan Join Date: Mar 2017 Location: Pittsburgh, PA iTrader: (0)	Why would it have a dial you could adjust though.. I thought it maybe had something to do with fuel pressure or maybe a boost fooler. I'm a diesel head, this is the first forced induction gasser i've had.
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03-14-2017, 09:37 PM	#5
limitdown First Lieutenant 187 Rep 337 Posts Drives: 2007 335i E93 Join Date: Jul 2015 Location: Location iTrader: (0)	It's a DP fix. The previous owner put it in to pass emissions. It needs to be dialed in to work correctly. For everyday driving, it must be removed, or over time it'll mess up your O2 sensor/AFR adaptations. It's possible he uninstalled and sold the catless downpipes to somebody else before selling this car, so you'll either need to scan with MHD (check the main MHD thread on the first page) or get it on a lift and visually check.
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