do downpipes smell?

john boxter · 05-07-2010, 04:33 PM

quick question to you guys that have aftermarket downpipes on your stock exhaust, is there any smell of gas at all? I can not tolerate that smell at all and I have the convertible so I can only imagine it being amplified do you guys smell anything or do the secondary cats take care of that?

thanks for you help!

enrita · 05-07-2010, 04:35 PM

as long as you have 1 set of cats in place no noticeable smell is produced.

Syndicategt · 05-07-2010, 04:51 PM

I have catted DP's and a catless exhaust. I can smell the exhaust a little bit when stopped for a long time, other than that, I can't smell a thing.

hun77777 · 05-07-2010, 05:32 PM

completely catless here and yes it does smell...

SV Concepts III · 05-07-2010, 05:43 PM

Catless will have a gas smell.

Martin46 · 05-07-2010, 05:46 PM

for enthusiastic drivers it isn't smell but perfume

klipseracer · 05-07-2010, 07:05 PM

Quote:

Originally Posted by Martin46

for enthusiastic drivers it isn't smell but perfume

I'm fully cat less and yes, it smells. Sometimes I feel that I can smell it on my clothes when I'm not even in my car.

john boxter · 05-07-2010, 08:44 PM

well i do plan on keeping my secondary cats so i just need to know from those who do have there stock exhaust on how it smells

cn555ic · 05-07-2010, 08:58 PM

Quote:

Originally Posted by klipseracer

I'm fully cat less and yes, it smells. Sometimes I feel that I can smell it on my clothes when I'm not even in my car.

+1...I smell it on my clothes sometimes if I start the car in the garage and fiddle with it!

import36 · 05-07-2010, 09:09 PM

Quote:

Originally Posted by cn555ic

+1...I smell it on my clothes sometimes if I start the car in the garage and fiddle with it!

+2

klipseracer · 05-07-2010, 09:31 PM

Quote:

Originally Posted by cn555ic

+1...I smell it on my clothes sometimes if I start the car in the garage and fiddle with it!

Quote:

Originally Posted by import36

+2

We're REAL car enthusiasts

See the nikka with the white socks? He ain't pimpin.

If you dont smell like noxious fumes, you ain't pimpin!

john boxter · 05-07-2010, 10:31 PM

haha if thats the case i dont wanna pimp lol just hoping that it wont smell but seems like most people say it will smell :s

enrita · 05-08-2010, 02:23 AM

it will smell catless but NOT if you keep one CAT in place. I run with 1 cat for one year and it did not smell. As i removed the secondary the difference in the smell was night and day.

vasillalov · 05-08-2010, 08:55 AM

I am expecting AR Design catless downpipes + Autobahn Exotics Performance exhaust with high-flow cats. I am hoping that there won't be too much smell.

Anyone running the same combo?

fast4door · 05-08-2010, 09:39 AM

Quote:

Originally Posted by Martin46

for enthusiastic drivers it isn't smell but perfume

lol..Im complete catless and it does smell, but I love that smell

BillLee · 05-08-2010, 09:54 AM

Quote:

Originally Posted by vasillalov

I am expecting AR Design catless downpipes + Autobahn Exotics Performance exhaust with high-flow cats. I am hoping that there won't be too much smell.

Anyone running the same combo?

im thinking about running that too.

john boxter · 05-08-2010, 10:00 AM

Quote:

Originally Posted by enrita

it will smell catless but NOT if you keep one CAT in place. I run with 1 cat for one year and it did not smell. As i removed the secondary the difference in the smell was night and day.

but based on the poll i have on top everyone is saying there is a smell even when you have the secondary cats in place as i said the stock exhaust is on

cn555ic · 05-08-2010, 10:05 AM

Quote:

Originally Posted by john boxter

but based on the poll i have on top everyone is saying there is a smell even when you have the secondary cats in place as i said the stock exhaust is on

You believe what you want, but alot of people have said with the secondary cats in place, there will be NO oder whatsover....maybe just in the beginning of the initial install, but after a day or so its no longer there

john boxter · 05-08-2010, 10:09 AM

perfect! thankyouuu, and hey cn555ic when did you put your resonators in in after your downpipe instal or after you exhaust instal aswell

cn555ic · 05-08-2010, 11:03 AM

Quote:

Originally Posted by john boxter

perfect! thankyouuu, and hey cn555ic when did you put your resonators in in after your downpipe instal or after you exhaust instal aswell

After downpipes...Without DPs I had no rasp, but after there was slight rasp but the resonators took care of that

cuban335i · 05-08-2010, 11:05 AM

Quote:

Originally Posted by Nando

lol..Im complete catless and it does smell, but I love that smell

+1... the smell on mine always reminds me of one of those go carts at those little tracks you can go to...

wonsungnabi · 05-08-2010, 11:08 AM

um.. this looks like a lot of fully catless guys voted instead of dp only

View Poll Results: Is there any smell of gas with aftermarket downpipes on the stock exhaust
no not all	8	24.24%
yes especially when the car is stopped	13	39.39%
a little bit but it is tolerable	12	36.36%
Voters: 33. You may not vote on this poll

05-07-2010, 04:33 PM	#1
john boxter Captain 35 Rep 763 Posts Drives: 2008 e93 Join Date: Sep 2009 Location: long Island New York iTrader: (3)	do downpipes smell? quick question to you guys that have aftermarket downpipes on your stock exhaust, is there any smell of gas at all? I can not tolerate that smell at all and I have the convertible so I can only imagine it being amplified do you guys smell anything or do the secondary cats take care of that? thanks for you help!
	Appreciate 0 Tweet Quote

05-07-2010, 04:35 PM	#2
enrita Major General 161 Rep 7,377 Posts Drives: 335i - Big turbos Join Date: Sep 2008 Location: Italian in Sweden iTrader: (0)	as long as you have 1 set of cats in place no noticeable smell is produced. __________________ 07 335i AT - MOTIV 750 - MHD E85 BMS flash - BMS PI - JB4G5 - Okada Coils - NGK 5992 Plugs - Helix IC - Snow Stg. 3 - Stett CP - Custom midpipes with 100 HJS Cats - Bastuck Quad - PSS10 - QUAIFE LSD - BMS OCC - Forge DVs - AR OC - ALCON BBK - M3 Chassi - Dinan CP - Velocity M rear Toe arms - Advan RZ-DF - LUX H8 - Level 10 AT upgrade
	Appreciate 0 Quote

05-07-2010, 04:51 PM	#3
Syndicategt Brigadier General 155 Rep 3,730 Posts Drives: 335i Join Date: Sep 2009 Location: Nor Cal iTrader: (11)	I have catted DP's and a catless exhaust. I can smell the exhaust a little bit when stopped for a long time, other than that, I can't smell a thing. __________________ 2008 BMW 335i e90 - Sold - Rob Beck Turbos / PROcede V5 / Aquamist HFS-4 / AR Downpipes / AE Exhaust / ER Comp FMIC / ER CP / TiAL BOV / Custom Intake / RPI Scoops / Quaife LSD / Swift-Koni Coilovers / DSS HS / Morr VS8.2 Sig Black / Michelin PSS / P3 Boost Guage / M3 body / M3 steering wheel / Adam's Rotors / Hawk HPS / SS lines /
	Appreciate 0 Quote

05-07-2010, 05:32 PM	#4
hun77777 Brigadier General 198 Rep 4,647 Posts Drives: SG E92 Join Date: Nov 2007 Location: Seattle WA iTrader: (58)	completely catless here and yes it does smell... __________________ SGE92TT......................... 12.331 Sec @ 117.89 Mph............................POWERED BY l BMS DCI l HELIX IC l FORGE DVs l RR OCC & CP & SCOOPS l AR 3" DPs l AE QUADs l BLISTEIN PSS10 l P3 VENT GUAGE l VISHNU PROCEDE V5 AUTOTUNE l Lots of Window Stickers
	Appreciate 0 Quote

05-07-2010, 05:43 PM	#5
SV Concepts III Lieutenant General 375 Rep 17,017 Posts Drives: BMW Duh Join Date: Apr 2005 Location: Santa Clara iTrader: (13)	Catless will have a gas smell.
	Appreciate 0 Quote

05-07-2010, 05:46 PM	#6
Martin46 Enlisted Member 8 Rep 47 Posts Drives: 330i + K&N Intake Join Date: Apr 2010 Location: EUROPE iTrader: (1)	for enthusiastic drivers it isn't smell but perfume
	Appreciate 0 Quote

05-07-2010, 08:44 PM	#8
john boxter Captain 35 Rep 763 Posts Drives: 2008 e93 Join Date: Sep 2009 Location: long Island New York iTrader: (3)	well i do plan on keeping my secondary cats so i just need to know from those who do have there stock exhaust on how it smells
	Appreciate 0 Quote

05-07-2010, 10:31 PM	#12
john boxter Captain 35 Rep 763 Posts Drives: 2008 e93 Join Date: Sep 2009 Location: long Island New York iTrader: (3)	haha if thats the case i dont wanna pimp lol just hoping that it wont smell but seems like most people say it will smell :s
	Appreciate 0 Quote

05-08-2010, 02:23 AM	#13
enrita Major General 161 Rep 7,377 Posts Drives: 335i - Big turbos Join Date: Sep 2008 Location: Italian in Sweden iTrader: (0)	it will smell catless but NOT if you keep one CAT in place. I run with 1 cat for one year and it did not smell. As i removed the secondary the difference in the smell was night and day. __________________ 07 335i AT - MOTIV 750 - MHD E85 BMS flash - BMS PI - JB4G5 - Okada Coils - NGK 5992 Plugs - Helix IC - Snow Stg. 3 - Stett CP - Custom midpipes with 100 HJS Cats - Bastuck Quad - PSS10 - QUAIFE LSD - BMS OCC - Forge DVs - AR OC - ALCON BBK - M3 Chassi - Dinan CP - Velocity M rear Toe arms - Advan RZ-DF - LUX H8 - Level 10 AT upgrade
	Appreciate 0 Quote

05-08-2010, 08:55 AM	#14
vasillalov Mad Linux Guru On The Loose 1121 Rep 5,397 Posts Drives: 2008 335i Sedan, 2023 M3 Join Date: Aug 2009 Location: Chicago, IL iTrader: (5) Garage List 2023 BMW M3 [0.00] 2008 335i E90 [8.00]	I am expecting AR Design catless downpipes + Autobahn Exotics Performance exhaust with high-flow cats. I am hoping that there won't be too much smell. Anyone running the same combo?
	Appreciate 0 Quote

05-08-2010, 10:09 AM	#19
john boxter Captain 35 Rep 763 Posts Drives: 2008 e93 Join Date: Sep 2009 Location: long Island New York iTrader: (3)	perfect! thankyouuu, and hey cn555ic when did you put your resonators in in after your downpipe instal or after you exhaust instal aswell
	Appreciate 0 Quote

05-08-2010, 11:08 AM	#22
wonsungnabi First Lieutenant 20 Rep 355 Posts Drives: E92 335 Join Date: Dec 2007 Location: Boston MA iTrader: (7)	um.. this looks like a lot of fully catless guys voted instead of dp only
	Appreciate 0 Quote