New Downpipe with Cat

BlueHen335d · 09-08-2018, 10:10 PM

Quote:

Originally Posted by Chief Orman

just ordered the full ATM catted down pipe and exhaust. Not trusting my POS Bulgarian crap exhaust is not leaking...the crap down pipe was too long any way...

Interested in your smell test after install. I'm considering the exact same setup when I do the ABC's in a few weeks.

Also interested in the sound test if you did mufflers. Or even if you didn't.

BB_cuda · 09-09-2018, 04:45 PM

I’ve been running gutted DPF (DOC still in) for almost 2 years. It is better smell than the Buzzken DOC we have on the X5. I was the one than dmanb2b mentioned had JR 2. I went to 2.8 this summer. I am now considering sending a downpipe to Matt W for DOC addition.

Megs335, I have a Bohl pipe that has a non diesel cat on it. Can you convert to DOC? Also have an Ecotune pipe with no cat. Let me know which would be better to convert to the DOC please. Thank you.

Chief Orman · 09-14-2018, 06:30 AM

Just put in the ATM cated downpipe and new exhaust...smell much better, downpipe fit better and exhaust higher quality.

BlueHen335d · 09-15-2018, 01:15 PM

Quote:

Originally Posted by Chief Orman

Just put in the ATM cated downpipe and new exhaust...smell much better, downpipe fit better and exhaust higher quality.

Thanks for the report. I'm going full ATM TBE with DOC and mufflers in a couple of weeks. Can't wait.

Spyro235 · 01-26-2019, 10:24 AM

Is anyone willing to post a sound video of a downpipes with a cat? Slight thread revival, but this seems like a good group to ask..
I'm curious if I'll still be able to hear some turbo whistle, or if it completely eliminates it. I don't want the smell, so I think I'm going to go for a catted pipe unless I can confirm in person that the smell isn't so bad!

Mik325tds · 01-30-2019, 05:31 PM

Quote:

Originally Posted by Spyro235

Is anyone willing to post a sound video of a downpipes with a cat? Slight thread revival, but this seems like a good group to ask..

What a timely thread revival. I'm visiting Matt this weekend to get a DOC welded into my downpipe. I can definitely make a short sound video after. My exhaust is stock otherwise with an empty SCR.

I was wondering though - since the DOCs only work well at higher temps, would it be beneficial to wrap the downpipe so it can retain the heat a bit longer when standing at a traffic light?

dmanb2b · 01-30-2019, 05:43 PM

Quote:

Originally Posted by Mik325tds

What a timely threat revival. I'm visiting Matt this weekend to get a DOC welded into my downpipe. I can definitely make a short sound video after. My exhaust is stock otherwise with an empty SCR.

I was wondering though - since the DOCs only work well at higher temps, would it be beneficial to wrap the downpipe so it can retain the heat a bit longer when standing at a traffic light?

Mine works really well once warmed up. Can comfortably stand behind car while idling and not feel like your clothes will stink of soot. Can't hurt wrapping, but works well without too

BB_cuda · 01-30-2019, 07:28 PM

DWR and I had talked way back when about wrapping the DP to get cat to work more effectively. I guess the EGT1 temp would increase some (minor impact though). I would do a before and after measure of the EGT1 to see actual delta. Good luck and let us know how the Matt mod goes please.

Asonchadwick · 01-31-2019, 05:31 AM

Quote:

Originally Posted by BB_cuda

DWR and I had talked way back when about wrapping the DP to get cat to work more effectively. I guess the EGT1 temp would increase some (minor impact though). I would do a before and after measure of the EGT1 to see actual delta. Good luck and let us know how the Matt mod goes please.

My cat is wrapped in a ceramic blanket and it's keep nice and warm and hit operating temps as soon as I drive off.

Spyro235 · 01-31-2019, 06:10 AM

Quote:

Originally Posted by Mik325tds

What a timely threat revival. I'm visiting Matt this weekend to get a DOC welded into my downpipe. I can definitely make a short sound video after. My exhaust is stock otherwise with an empty SCR.

That would be great! mainly wondering about drone and turbo whistle... I wouldn't mind hearing the turbos, but drone is the enemy. I've got an X5 though, so I'm not sure what that means for volume/ drone in my setup vs yours.

BB_cuda · 01-31-2019, 09:59 AM

Quote:

Originally Posted by Asonchadwick

My cat is wrapped in a ceramic blanket and it's keep nice and warm and hit operating temps as soon as I drive off.

Got a before and after wrap comparison, please? EGT1 only one still operating. A normal going down freeway number is what I’m interested. Not at idle nor WOT please sir.

Asonchadwick · 01-31-2019, 11:06 PM

Normal freeway is about 450

Asonchadwick · 01-31-2019, 11:07 PM

Before I can't recall

Mik325tds · 02-01-2019, 12:35 PM

Quote:

Originally Posted by Asonchadwick

My cat is wrapped in a ceramic blanket and it's keep nice and warm and hit operating temps as soon as I drive off.

How did you get a ceramic blanket around the downpipe? Do you have a link for me?

BB_cuda: unfortunately, I won't be able to do before/after measurements because the downpipe is already off...

Asonchadwick · 02-01-2019, 02:32 PM

[QUOTE=Mik325tds;24322535]How did you get a ceramic blanket around the downpipe? Do you have a link for me?

BB_cuda: unfortunately, I won't be able to do before/after measurements because the downpipe is already off...

Getting blanket on with dp off car was easy but messy, getting in while in car was really bad.

Asonchadwick · 02-01-2019, 02:34 PM

https://m.facebook.com/groups/188773...91097081128154

BB_cuda · 02-02-2019, 11:01 AM

Quote:

Originally Posted by Asonchadwick

Normal freeway is about 450

Temperature units, boy! I presume degF. I'm a thermal engineer so this is the reason for my pickiness (and poor spelling).

Mik325tds · 02-02-2019, 01:44 PM

Quote:

Originally Posted by Asonchadwick

https://m.facebook.com/groups/188773...91097081128154

Thanks! But:
Page cannot be displayed...

Owen81 · 02-02-2019, 10:36 PM

You have to be a member of the group to view the posts, I assume you aren't on Facebook.

Here is what he linked:

Asonchadwick · 02-03-2019, 02:50 PM

Yep that's the one nice pics. My egt is reading typically around 450f just driving normal around town. When you coast it reads lower like in the upper 300s and then warms back up and when I use moderate throttle it climbs to around 500. I need to log it that's really the best way to show.

BB_cuda · 02-04-2019, 12:31 PM

Thank you for that temp description. Very helpful.

outbackid84 · 01-11-2021, 09:47 PM

Did anybody post a video of the exhaust sound of 335d with any brand high flow cat?

09-09-2018, 04:45 PM	#24
BB_cuda Brigadier General 762 Rep 3,555 Posts Drives: 2011 335D Msport, 2013 X5D Join Date: Nov 2011 Location: Clear Lake, Texas iTrader: (0)	I’ve been running gutted DPF (DOC still in) for almost 2 years. It is better smell than the Buzzken DOC we have on the X5. I was the one than dmanb2b mentioned had JR 2. I went to 2.8 this summer. I am now considering sending a downpipe to Matt W for DOC addition. Megs335, I have a Bohl pipe that has a non diesel cat on it. Can you convert to DOC? Also have an Ecotune pipe with no cat. Let me know which would be better to convert to the DOC please. Thank you. Last edited by BB_cuda; 09-09-2018 at 04:50 PM..
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09-14-2018, 06:30 AM	#25
Chief Orman Major 671 Rep 1,442 Posts Drives: 335D 2010 Join Date: Jun 2013 Location: East Bay, Nor Cal iTrader: (0)	Just put in the ATM cated downpipe and new exhaust...smell much better, downpipe fit better and exhaust higher quality.
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01-26-2019, 10:24 AM	#27
Spyro235 Captain 259 Rep 714 Posts Drives: '10 X5D, '04 330i ZHP Join Date: Jan 2017 Location: CO iTrader: (0)	Is anyone willing to post a sound video of a downpipes with a cat? Slight thread revival, but this seems like a good group to ask.. I'm curious if I'll still be able to hear some turbo whistle, or if it completely eliminates it. I don't want the smell, so I think I'm going to go for a catted pipe unless I can confirm in person that the smell isn't so bad! __________________ Daily/ Tow: 2010 X5 35D - 326k, Deleted w/DUDMD Stage 2, Sutphin Trans tune, Comfort seat retrofit Fun car: 2004 ZHP 6mt - 256k miles, z4m FCAB, stock. Drift car: 2001 330i for sale
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01-30-2019, 07:28 PM	#30
BB_cuda Brigadier General 762 Rep 3,555 Posts Drives: 2011 335D Msport, 2013 X5D Join Date: Nov 2011 Location: Clear Lake, Texas iTrader: (0)	DWR and I had talked way back when about wrapping the DP to get cat to work more effectively. I guess the EGT1 temp would increase some (minor impact though). I would do a before and after measure of the EGT1 to see actual delta. Good luck and let us know how the Matt mod goes please.
	Appreciate 0 Quote

01-31-2019, 11:06 PM	#34
Asonchadwick Sleepy 75 Rep 367 Posts Drives: bmw Join Date: Jun 2017 Location: usa iTrader: (0)	Normal freeway is about 450
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01-31-2019, 11:07 PM	#35
Asonchadwick Sleepy 75 Rep 367 Posts Drives: bmw Join Date: Jun 2017 Location: usa iTrader: (0)	Before I can't recall
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02-01-2019, 02:32 PM	#37
Asonchadwick Sleepy 75 Rep 367 Posts Drives: bmw Join Date: Jun 2017 Location: usa iTrader: (0)	[QUOTE=Mik325tds;24322535]How did you get a ceramic blanket around the downpipe? Do you have a link for me? BB_cuda: unfortunately, I won't be able to do before/after measurements because the downpipe is already off... Getting blanket on with dp off car was easy but messy, getting in while in car was really bad.
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02-01-2019, 02:34 PM	#38
Asonchadwick Sleepy 75 Rep 367 Posts Drives: bmw Join Date: Jun 2017 Location: usa iTrader: (0)	https://m.facebook.com/groups/188773...91097081128154
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02-02-2019, 10:36 PM	#41
Owen81 Lieutenant 83 Rep 432 Posts Drives: 335d, 17/22 TDI Join Date: May 2015 Location: Alberta, Canada iTrader: (0)	You have to be a member of the group to view the posts, I assume you aren't on Facebook. Here is what he linked:
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02-03-2019, 02:50 PM	#42
Asonchadwick Sleepy 75 Rep 367 Posts Drives: bmw Join Date: Jun 2017 Location: usa iTrader: (0)	Yep that's the one nice pics. My egt is reading typically around 450f just driving normal around town. When you coast it reads lower like in the upper 300s and then warms back up and when I use moderate throttle it climbs to around 500. I need to log it that's really the best way to show.
	Appreciate 0 Quote

02-04-2019, 12:31 PM	#43
BB_cuda Brigadier General 762 Rep 3,555 Posts Drives: 2011 335D Msport, 2013 X5D Join Date: Nov 2011 Location: Clear Lake, Texas iTrader: (0)	Thank you for that temp description. Very helpful.
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01-11-2021, 09:47 PM	#44
outbackid84 New Member 0 Rep 5 Posts Drives: 2011 BMW 335d Join Date: Jan 2021 Location: Arizona iTrader: (0)	Any videos of 335d with high flow cat? Did anybody post a video of the exhaust sound of 335d with any brand high flow cat?
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