muffler removal questions

techno10 · 01-31-2018, 08:31 PM

I found a local shop that's willing to remove the mufflers and go straight pipe or replace the mufflers with something that'll hopefully be louder than stock. I want to keep both cat's so muffler delete/replacement is my only option. I actually searched the forums before asking this and I couldn't find a similar question. On the right muffler there is a value with a line running off of it.

1) what does this value do
2) can we just plug the line if I remove the entire muffler with the value? Will this cause any sort of CEL (check engine light)? Or should I just leave the line open?
3) I couldn't trace where the line actually ran to.. anyone know?

I gotta say this car stock (sdrive35is) is very quiet so I want to try to do something to make it sound more sporty.

thanks,
Mike

jparnes1 · 01-31-2018, 09:21 PM

You can disconnect the hose from the valve. No cel. People do it all the time so that the valve is always open and you get more sound at start up.
Funny that you think your 35is muffler is too quiet. That's what I thought about my 35i muffler. Then I had a 35is muffler welded on. Just right!

NoQuarter · 02-01-2018, 11:14 PM

The 35is muffler is perfect in my opinion

Love it

01-31-2018, 08:31 PM	#1
techno10 Enlisted Member 3 Rep 48 Posts Drives: 2011 335 xi Join Date: Aug 2013 Location: qtown, pa iTrader: (0)	muffler removal questions I found a local shop that's willing to remove the mufflers and go straight pipe or replace the mufflers with something that'll hopefully be louder than stock. I want to keep both cat's so muffler delete/replacement is my only option. I actually searched the forums before asking this and I couldn't find a similar question. On the right muffler there is a value with a line running off of it. 1) what does this value do 2) can we just plug the line if I remove the entire muffler with the value? Will this cause any sort of CEL (check engine light)? Or should I just leave the line open? 3) I couldn't trace where the line actually ran to.. anyone know? I gotta say this car stock (sdrive35is) is very quiet so I want to try to do something to make it sound more sporty. thanks, Mike
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01-31-2018, 09:21 PM	#2
jparnes1 Colonel 241 Rep 2,387 Posts Drives: 2016 340i, 2012 Z4 35i Join Date: Jan 2010 Location: NY iTrader: (1)	You can disconnect the hose from the valve. No cel. People do it all the time so that the valve is always open and you get more sound at start up. Funny that you think your 35is muffler is too quiet. That's what I thought about my 35i muffler. Then I had a 35is muffler welded on. Just right! __________________ 2016 340i XDrive, EBII/black, 6 MT, M Sport, Track Handling, Cold Weather, Tech, Lighting, Driver Assistance Plus. 2012 Z4 35i, ED 2/24/2012, Melbourne Red Metallic, Black Leather, Carbon Trim, 6MT, M Sport, CW, PP, PS, NAV, CA.
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02-01-2018, 11:14 PM	#3
NoQuarter Captain 164 Rep 906 Posts Drives: 2008 535xi / 2011 Z4 35Is Join Date: Jan 2011 Location: Indiana iTrader: (0) Garage List 2018 BMW X2 [0.00] 2008 535xi [0.00] 2011 Z4 35is [0.00]	The 35is muffler is perfect in my opinion Love it
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