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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N55 Turbo Engine Tuning and Exhaust Modifications - 335i Tuning > N55 AR 4" Catless Downpipe Fuel Smell? Is It That Bad?



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      07-19-2011, 01:38 PM   #1
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N55 AR 4" Catless Downpipe Fuel Smell? Is It That Bad?

Ok so I haven't installed my AR 4" Catless Downpipe yet, but from what I've been reading from other members is that I am getting mixed information about the fuel smell at idle as some have it worse than others and others don't have the smell. I understand the gains of the having the CDP installed and would like to hear from you if the smell is really that bad. If I do have it installed, is it better to run on the stock exhaust so the smell won't be as bad? Also since my wife is pregnant, her nose sensitivity is higher than normal so I'm trying to avoid getting on her bad side....lol
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      07-19-2011, 01:43 PM   #2
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Depends what you define as bad.

It is noticeable.
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      07-19-2011, 01:44 PM   #3
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If your running the AR CDP, you are essentially Cat free right? What I'm driving at is that the N55 doesn't have any other cats other than what is on the DP right? I think I recall seeing the Xi with 2nd cats in a thread a while back, but not sure if that was confirmed as cats or just resonators...
Anyway, what I'm driving at is that even with a stock exhaust (if no secondary cats exist on it) will smell just as bad as an aftermarket exhaust with the AR CDP. There is no secondary filter (cat) to remove the smell... Hopefully someone can chime in though who has this or a similar setup to let us know.
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      07-19-2011, 01:49 PM   #4
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Quote:
Originally Posted by Rich@GTBPerformance View Post
Depends what you define as bad.

It is noticeable.
Bad as in being on idle with the front windows down on a red light and smelling fuel.
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      07-19-2011, 01:50 PM   #5
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Quote:
Originally Posted by Army335xi View Post
If your running the AR CDP, you are essentially Cat free right? What I'm driving at is that the N55 doesn't have any other cats other than what is on the DP right? I think I recall seeing the Xi with 2nd cats in a thread a while back, but not sure if that was confirmed as cats or just resonators...
Anyway, what I'm driving at is that even with a stock exhaust (if no secondary cats exist on it) will smell just as bad as an aftermarket exhaust with the AR CDP. There is no secondary filter (cat) to remove the smell... Hopefully someone can chime in though who has this or a similar setup to let us know.
+1 anyone out there?
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      07-19-2011, 02:16 PM   #6
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At first you can notice it, but I've either gotten use to it or its just not there anymore..

But if you must, buy these for now

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      07-19-2011, 03:19 PM   #7
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Quote:
Originally Posted by shockin330i View Post
At first you can notice it, but I've either gotten use to it or its just not there anymore..

But if you must, buy these for now

LOL do they really work or is this a joke?
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      07-19-2011, 04:05 PM   #8
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No, they work, they're just expensive. like 8 bucks a bottle. I love going to the racetracks and smelling these. Maybe you could start off with half a bottle per fill up.
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      07-19-2011, 04:15 PM   #9
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Quote:
Originally Posted by shockin330i View Post
No, they work, they're just expensive. like 8 bucks a bottle. I love going to the racetracks and smelling these. Maybe you could start off with half a bottle per fill up.
Hmm ok so I assume it's safe to put this in your gas tank? Are these available only online or can they be purchased at Pep Boys or Kragen?
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      07-19-2011, 04:28 PM   #10
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Smell was pretty bad for me.
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      07-19-2011, 04:56 PM   #11
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Quote:
Originally Posted by keikdasneak View Post
Smell was pretty bad for me.
Yeah thanks for the heads up keik! I read your post about the smell and I don't want that to happen to me. I believe you had a Vishnu DP right? Does it matter if it's Vishnu, AR or any other manufacturer? Was it the kind of fuel smell that when a bus passes by and your standing outside next to it or your windows are rolled down in your car? I'm still not 100% on getting this installed.
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      07-19-2011, 05:00 PM   #12
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Quote:
Originally Posted by Army335xi View Post
If your running the AR CDP, you are essentially Cat free right? What I'm driving at is that the N55 doesn't have any other cats other than what is on the DP right? I think I recall seeing the Xi with 2nd cats in a thread a while back, but not sure if that was confirmed as cats or just resonators...
Anyway, what I'm driving at is that even with a stock exhaust (if no secondary cats exist on it) will smell just as bad as an aftermarket exhaust with the AR CDP. There is no secondary filter (cat) to remove the smell... Hopefully someone can chime in though who has this or a similar setup to let us know.

it will smell with catless DP.
it'll throw a code (there's a fix for that)
if u have a sensitive nose, at idle you'll smell it. (windows up / ac on will shield it.)
driving u'll hardly notice -
like ernie said - u get use to it.

- xi n55 have 2ndary cats on mid pipe. primary cat on the DP.
- i n55 both cats are stuff'd on the DP.

u can get single catted DP if u don't want catless - that'll take
care of the smell.
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      07-19-2011, 05:40 PM   #13
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^ Correct if u have the Xi u will still have a cat that will scrub some but not all of the smell..the i model...u will be catless..and u will def smell it.

I am full catless. I love the smell of napalm in the morning..
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      07-19-2011, 05:49 PM   #14
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Quote:
Originally Posted by FrankiE90 View Post
it will smell with catless DP.
it'll throw a code (there's a fix for that)
if u have a sensitive nose, at idle you'll smell it. (windows up / ac on will shield it.)
driving u'll hardly notice -
like ernie said - u get use to it.

- xi n55 have 2ndary cats on mid pipe. primary cat on the DP.
- i n55 both cats are stuff'd on the DP.

u can get single catted DP if u don't want catless - that'll take
care of the smell.
Thanks for the info Frankie! Now, do you have any advice on having the catless dp installed and taking the car in for the complimentary service to the dealer? Will they flag the CT connected to the OBD2 set to auto deleting the error code? Btw I bought my car at Crevier as I am not sure how strict they are with having mods.
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      07-19-2011, 06:38 PM   #15
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Quote:
Originally Posted by mrj25 View Post
Thanks for the info Frankie! Now, do you have any advice on having the catless dp installed and taking the car in for the complimentary service to the dealer? Will they flag the CT connected to the OBD2 set to auto deleting the error code? Btw I bought my car at Crevier as I am not sure how strict they are with having mods.

that's the thing right there -
u can't easily remove the DP -

just have a good relationship with ur SA - know ur tech.
have the CT on there, there are some dealers that will be cool.
make sure ur tune is out as always...
that's a tough call, i'll pm you.
there's always a risk.
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      07-19-2011, 06:45 PM   #16
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I have the Vishnu dp on my 2011 x-drive and I don't smell anything.
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      07-19-2011, 07:15 PM   #17
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Quote:
Originally Posted by MJR63 View Post
I have the Vishnu dp on my 2011 x-drive and I don't smell anything.
that's Cuz xdrive has two secondary cats
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      07-19-2011, 08:40 PM   #18
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Quote:
Originally Posted by MJR63 View Post
I have the Vishnu dp on my 2011 x-drive and I don't smell anything.
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      07-19-2011, 09:33 PM   #19
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One could always bolt on a n54 exhaust and have 2 rear cats
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      07-19-2011, 10:00 PM   #20
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Quote:
Originally Posted by mrj25 View Post
Bad as in being on idle with the front windows down on a red light and smelling fuel.
why my 3.5" vishnu catless dp does not smell too bad as you describe...
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      07-19-2011, 10:56 PM   #21
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Quote:
Originally Posted by shockin330i View Post
One could always bolt on a n54 exhaust and have 2 rear cats
hmmm that's a possibility. are there any N55ers that gone this route?
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      07-19-2011, 11:00 PM   #22
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Quote:
Originally Posted by ian2002525 View Post
why my 3.5" vishnu catless dp does not smell too bad as you describe...
I don't have a vishnu catless dp, though I have heard from others the smell is an annoyance. I need to make a trip out to LTBMW and smell a car that has a catless dp.
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