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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Friend wants to unbolt exhaust on 550i



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      01-20-2013, 01:00 AM   #1
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I've got a friend who's getting paid to remove the two bolts holding the (secondary?) cats and mufflers off of a 2012 550i.
I'm believe he is going to place spacers over the bolts so that there is an exhaust leak created.
Aside from the obvious pollution of the environment, won't the engine light come on when the readings from the oxygen sensors are off?
or are the sensors not on the exhaust but rather on the down pipes?

It's a simple question; is the car going to be harmed (and therefore my friend shouldn't make a quick buck off of this stranger)?
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      01-20-2013, 01:33 AM   #2
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Sensors are on the DPs itself... Though, I do not know if causing an exhaust leak will throw codes.
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      01-20-2013, 01:53 AM   #3
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alot of people do this to have a slightly louder exhaust note. popular in the subaru scene

car will run perfectly fine. probably wont throw a check engine light
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      01-20-2013, 09:59 AM   #4
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I've never heard of anyone doing that before. If you have a good ear you can usually hear an exhaust leak.
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      01-20-2013, 10:03 AM   #5
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This sounds like a really crap idea. I see the reasoning - it's a cheap way to make the car louder without buying a full performance exhaust - BUT - exhaust gases are very corrosive, so anything that they're hitting will be damaged over time, plus, there's health/safety reasons why the tailpipe is run to behind the passenger compartment. Finally, there's a difference to an educated ear between an exhaust leak and an exhaust system that's intended to be loud. Personally I'd pass on the job and advise the owner of the car to just spend a little more money and have some louder mufflers welded in.
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      01-20-2013, 10:07 AM   #6
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Quote:
Originally Posted by zeenon53 View Post
I've never heard of anyone doing that before. If you have a good ear you can usually hear an exhaust leak.
+1 you'll hear a V8 rumble + the sound of an exhaust leak, it'll be a pffffffffffff paper-blowing-in-a-fan noise caused by the exhaust gases hitting against the "inlet" of the remaining exhaust pipes where he has it spaced off.
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      01-20-2013, 01:18 PM   #7
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Quote:
Originally Posted by N8N View Post
This sounds like a really crap idea. I see the reasoning - it's a cheap way to make the car louder without buying a full performance exhaust - BUT - exhaust gases are very corrosive, so anything that they're hitting will be damaged over time, plus, there's health/safety reasons why the tailpipe is run to behind the passenger compartment. Finally, there's a difference to an educated ear between an exhaust leak and an exhaust system that's intended to be loud. Personally I'd pass on the job and advise the owner of the car to just spend a little more money and have some louder mufflers welded in.
Perfectly stated! This is a dumb idea for a $60,000+ car.
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      01-21-2013, 01:49 PM   #8
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Quote:
Originally Posted by JamesM3M5 View Post
Perfectly stated! This is a dumb idea for a $60,000+ car.
Yeah i think the owner realized it.. he was a young fellow
he said he had to leave, but that he'd be back
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      01-21-2013, 08:14 PM   #9
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This is the strangest thread I've read in a while.
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      01-21-2013, 08:41 PM   #10
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Quote:
Originally Posted by Tiago@VRSF View Post
This is the strangest thread I've read in a while.
agreed. If you have the money to drop on a car like that, why would you do something so backyard-chopshop...ish.
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      01-22-2013, 10:27 AM   #11
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The car should be fine. Similar to the old school mod of drilling a few holes in a motorcycle exhaust. I did it to my CB650 when I was a kid and boy was my dad pissed.
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Last edited by ken1137; 01-22-2013 at 10:33 AM.
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      01-22-2013, 03:26 PM   #12
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Quote:
Originally Posted by Tiago@VRSF View Post
This is the strangest thread I've read in a while.
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      01-22-2013, 04:26 PM   #13
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Sounds pretty shady to me.....
Remind me to never do business with your friend..
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