Magnaflow exhaust install question - BMW 3-Series (E90 E92) Forum

firesnatch · 09-23-2012, 11:36 AM

So I installed the magnaflow 16537 catback for my 2008 328i today. The directions say to block off a redundant vacuum hose by screwing a 6mm bolt into it and using zip ties.

http://www.autopartsnetwork.com/imag...sset/16537.pdf

During the installation process I did not see a vacuum hose anywhere. Is this a mistake in the directions? Or where might I find this mysterious hose? Thanks.

Code:

EDIT:  Added video with sound - http://www.youtube.com/watch?v=LmBSs_s_Hgo

Doc K · 09-23-2012, 11:40 AM

No vacuum hose on my car when I did a muffler delete. Maybe the 325i and 328i are different in that aspect?

monkey_wrench · 09-23-2012, 12:57 PM

I think that's for the 330i only, the 330i and 335 have vacuum operated a valve on the muffler.

Not sure what it does, but by plugging it you'd be doing the "golf tee mod"

GermanMuscle · 09-23-2012, 04:52 PM

make sure you post some videos after you install

flinchy · 09-23-2012, 05:14 PM

Quote:

Originally Posted by monkey_wrench

I think that's for the 330i only, the 330i and 335 have vacuum operated a valve on the muffler.

Not sure what it does, but by plugging it you'd be doing the "golf tee mod"

Makes it quiet on startup, warms up faster

firesnatch · 09-23-2012, 06:24 PM

Thanks guys. There wasn't a hose on the old muffler, so yeah, those directions must be for another car. That does sound just like the golf-tee mod.

I didn't get time to make video today, but I'll make one soon. I couldn't find one anywhere prior to purchasing the exhaust, so I was taking a chance. It has a nice deep note, but not nearly as loud as I would have liked it to be at WOT. Definitely an improvement over the stock exhaust.

monkey_wrench · 09-23-2012, 07:25 PM

Quote:

Originally Posted by flinchy

Makes it quiet on startup, warms up faster

Is that what it's for?

Interesting...

flinchy · 09-24-2012, 02:33 AM

Quote:

Originally Posted by monkey_wrench

Is that what it's for?

Interesting...

Yeah, a bit more back pressure on cold start keeps the gases in for a bit longer and warms the cats up faster (for emissions stuff)

yeah, golf tee mod makes it REALLY crackly and loud for me on cold start, it's awesome

apparently when warm there's meant to be no difference, it's pretty smooth when warm anyway

firesnatch · 09-29-2012, 05:55 PM

Added link to video I made in OP.

09-23-2012, 11:36 AM	#1
firesnatch New Member Drives: 2008 328i Join Date: Apr 2011 Location: United States Posts: 15 iTrader: (0)	Magnaflow exhaust install question So I installed the magnaflow 16537 catback for my 2008 328i today. The directions say to block off a redundant vacuum hose by screwing a 6mm bolt into it and using zip ties. http://www.autopartsnetwork.com/imag...sset/16537.pdf During the installation process I did not see a vacuum hose anywhere. Is this a mistake in the directions? Or where might I find this mysterious hose? Thanks. Code: EDIT: Added video with sound - http://www.youtube.com/watch?v=LmBSs_s_Hgo Last edited by firesnatch; 09-29-2012 at 05:54 PM. Reason: Added sound clip
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09-23-2012, 11:40 AM	#2
Doc K Fleet Admiral ★★★★★ Drives: E90 325i SG Join Date: Feb 2011 Location: Woodinville Posts: 499 iTrader: (2)	No vacuum hose on my car when I did a muffler delete. Maybe the 325i and 328i are different in that aspect?

09-23-2012, 12:57 PM	#3
monkey_wrench Caught the Bimmer-Bug Drives: '06 330i Join Date: Aug 2011 Location: Florida Posts: 601 iTrader: (7) Garage List 2006 330i [0.00]	I think that's for the 330i only, the 330i and 335 have vacuum operated a valve on the muffler. Not sure what it does, but by plugging it you'd be doing the "golf tee mod"

09-23-2012, 04:52 PM	#4
GermanMuscle Once you drive a Bimmer, you always drive a Bimmer Drives: 2011 e90 Join Date: May 2012 Location: Atlanta Posts: 230 iTrader: (1)	make sure you post some videos after you install

09-23-2012, 06:24 PM	#6
firesnatch New Member Drives: 2008 328i Join Date: Apr 2011 Location: United States Posts: 15 iTrader: (0)	Thanks guys. There wasn't a hose on the old muffler, so yeah, those directions must be for another car. That does sound just like the golf-tee mod. I didn't get time to make video today, but I'll make one soon. I couldn't find one anywhere prior to purchasing the exhaust, so I was taking a chance. It has a nice deep note, but not nearly as loud as I would have liked it to be at WOT. Definitely an improvement over the stock exhaust.

09-29-2012, 05:55 PM	#9
firesnatch New Member Drives: 2008 328i Join Date: Apr 2011 Location: United States Posts: 15 iTrader: (0)	Added link to video I made in OP.