Adverse effect on full exhaust

yellowstone · 12-16-2009, 03:51 AM

Hi Guys,

I really want to change the sound of my car right now and i'm looking at an eisenmann race exhaust with some mid section either hfc or cat deletes. However rather than just tossing a system together and seeing what happens I'd like to hear what the group has to say.

Now the question to you all is: what problems have you guys encountered after you put in a full exhaust system? I've heard some say CEL comes on and some say that it doesn't.

It's pretty hard to aggregate all the exhaust threads and come to a conclusion so I figured I'd start this thread.

So if you have a minute and you have a full exhaust system on your car why don't you tell me a little bit about the experience with the system. IE engine errors, failures, back-pressure issues, tickets...

Thanks,
-Ken

FStop7 · 12-16-2009, 03:53 AM

If you remove your forward cats and do not modify the ECU then you will eventually get a check engine light, sooner or later. It may take a month, it may take a few days. If you don't want to mess with your ECU you can simply clear the fault code for bad cats with most any OBD2 scanner. I bought one for $59 at Autozone. I like to have one around since it will work on any 1996+ car.

CSanto · 12-16-2009, 10:35 AM

There are 3 adverse effects of a full exhaust system
1) Throwing a CEL
2) Not passing Inspection, or Emission testing
3) The Exhaust Smell

MN M3 · 12-16-2009, 02:24 PM

Don't forget the 4th adverse effect of doing a complete exhaust swap - deletion of your powertrain warranty. Removing the cats, etc. will void it. Plus, you won't pass emissions, etc.

montreal red · 12-16-2009, 03:56 PM

Quote:

Originally Posted by HREM3

There are 3 adverse effects of a full exhaust system
1) Throwing a CEL
2) Not passing Inspection, or Emission testing
3) The Exhaust Smell

nicely summed up...

you can add exhaust tickets to that list. if your car is unnaturally loud then you WILL get a ticket. esp if you live in a city with a lot of police patrol.

it looks like you are concerned with the negative effects... then a full exhaust if NOT for you. if you have to ask these questions, you shouldnt be going to a full exhaust. people who go for full exhaust systems often want power and sound and dont really care bout CELs, exhaust fumes, state inspections or tickets... they usually deal with each issue as it comes along...

smokinjoe64 · 12-16-2009, 04:18 PM

Quote:

Originally Posted by montreal red

nicely summed up...

you can add exhaust tickets to that list. if your car is unnaturally loud then you WILL get a ticket. esp if you live in a city with a lot of police patrol.

it looks like you are concerned with the negative effects... then a full exhaust if NOT for you. if you have to ask these questions, you shouldnt be going to a full exhaust. people who go for full exhaust systems often want power and sound and dont really care bout CELs, exhaust fumes, state inspections or tickets... they usually deal with each issue as it comes along...

...great summary observation, and wholly true.

ihyln · 12-16-2009, 05:05 PM

I think the fine for not having cats in my state is a few grand. I don't know the exact number but it's one reason why I'll never go catless.

xxe92xx · 12-16-2009, 05:42 PM

Quote:

Originally Posted by montreal red

nicely summed up...

you can add exhaust tickets to that list. if your car is unnaturally loud then you WILL get a ticket. esp if you live in a city with a lot of police patrol.

it looks like you are concerned with the negative effects... then a full exhaust if NOT for you. if you have to ask these questions, you shouldnt be going to a full exhaust. people who go for full exhaust systems often want power and sound and dont really care bout CELs, exhaust fumes, state inspections or tickets... they usually deal with each issue as it comes along...

exactly!

FStop7 · 12-16-2009, 06:19 PM

Quote:

Originally Posted by MN M3

Don't forget the 4th adverse effect of doing a complete exhaust swap - deletion of your powertrain warranty. Removing the cats, etc. will void it. Plus, you won't pass emissions, etc.

If you're worried about that then a pulley is going to be even more of a risk.

yellowstone · 12-17-2009, 12:37 AM

Actually I just want to learn through the community. I will put on a full exhaust system I just want to know what to watch out for...

Quote:

Originally Posted by montreal red

nicely summed up...

you can add exhaust tickets to that list. if your car is unnaturally loud then you WILL get a ticket. esp if you live in a city with a lot of police patrol.

it looks like you are concerned with the negative effects... then a full exhaust if NOT for you. if you have to ask these questions, you shouldnt be going to a full exhaust. people who go for full exhaust systems often want power and sound and dont really care bout CELs, exhaust fumes, state inspections or tickets... they usually deal with each issue as it comes along...

12-16-2009, 03:51 AM	#1
yellowstone Private Drives: 2009 SG E92 M3 Join Date: Nov 2009 Location: Los Angeles Posts: 63 iTrader: (0)	Adverse effect on full exhaust Hi Guys, I really want to change the sound of my car right now and i'm looking at an eisenmann race exhaust with some mid section either hfc or cat deletes. However rather than just tossing a system together and seeing what happens I'd like to hear what the group has to say. Now the question to you all is: what problems have you guys encountered after you put in a full exhaust system? I've heard some say CEL comes on and some say that it doesn't. It's pretty hard to aggregate all the exhaust threads and come to a conclusion so I figured I'd start this thread. So if you have a minute and you have a full exhaust system on your car why don't you tell me a little bit about the experience with the system. IE engine errors, failures, back-pressure issues, tickets... Thanks, -Ken
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12-16-2009, 03:53 AM	#2
FStop7 I like cars Drives: M6 Join Date: Oct 2008 Location: Newbury Park, CA Posts: 5,061 iTrader: (3)	If you remove your forward cats and do not modify the ECU then you will eventually get a check engine light, sooner or later. It may take a month, it may take a few days. If you don't want to mess with your ECU you can simply clear the fault code for bad cats with most any OBD2 scanner. I bought one for $59 at Autozone. I like to have one around since it will work on any 1996+ car. __________________ My photostream: http://www.flickr.com/photos/racelap/

12-16-2009, 02:24 PM	#4
MN M3 Private First Class Drives: 2009 E92 M3 Join Date: Oct 2009 Location: Southern MN, USA Posts: 133 iTrader: (0)	Don't forget the 4th adverse effect of doing a complete exhaust swap - deletion of your powertrain warranty. Removing the cats, etc. will void it. Plus, you won't pass emissions, etc. __________________ 2009 E92 M3 - Jerez Black/Black w/ black carbon leather interior, 6 spd., Cold, Premium, Technology, 19" OZ Racing wheels (black), iPod/USB. Mods: aPe air filter, Borla exhaust, H&R sport springs, UUC Evo3 SS w/ DSSR, Power Pulley Kit, carbon kidney grills, Vorsteiner front air dam, carbon side gills, smoked side markers

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12-16-2009, 10:35 AM	#3
CSanto Major Drives: 2009 E92 M3 Join Date: Feb 2009 Location: New York Posts: 1,316 iTrader: (1)	There are 3 adverse effects of a full exhaust system 1) Throwing a CEL 2) Not passing Inspection, or Emission testing 3) The Exhaust Smell

12-16-2009, 05:05 PM	#7
ihyln Banned Drives: M3post sucks Join Date: Apr 2008 Location: M3post sucks Posts: 3,386 iTrader: (1) Garage List 2008 M3 [0.00] 2002 530i [0.00]	I think the fine for not having cats in my state is a few grand. I don't know the exact number but it's one reason why I'll never go catless.