Secondary Cats

NFrangoulis96 · 04-24-2016, 01:11 PM

I've been thinking lately, I'm already running a catless downpipe, why not just get rid of the secondary cats and keep my stock mufflers... Has anyone done this setup? (So it would be whole exhaust is stock except for the removal of the primary and secondary cats)

fdawg4l · 04-24-2016, 02:10 PM

Hell yeah, f*#ck the environment and the air you breathe. Moar *brap* brah!

GoCougs · 04-24-2016, 02:31 PM

My secondary cats don't seem to work. I still smell exhaust even though I haven't removed them.

David1 · 04-29-2016, 11:47 AM

Quote:

Originally Posted by GoCougs

My secondary cats don't seem to work. I still smell exhaust even though I haven't removed them.

That's because secondary cats are not designed to work as primary.

f87.lci · 04-29-2016, 06:15 PM

How much more smell do you get by removing secondary cats if you are already catless ?

joshe92 · 07-14-2016, 11:39 AM

Where can you buy the T-pipes for secondary cat removal?

07-14-2016, 12:18 PM

Quote:

Originally Posted by Adeel

How much more smell do you get by removing secondary cats if you are already catless ?

All of it.

Mikaeldarer · 07-14-2016, 02:17 PM

Quote:

Originally Posted by NFrangoulis96

I've been thinking lately, I'm already running a catless downpipe, why not just get rid of the secondary cats and keep my stock mufflers... Has anyone done this setup? (So it would be whole exhaust is stock except for the removal of the primary and secondary cats)

Quote:

Originally Posted by joshe92

Where can you buy the T-pipes for secondary cat removal?

Just knock out the secondary cats. The cores are ceramic and can be easily broken up with chisel and hammer. I did this for PE Mod and worked perfectly.

mashimarho · 07-14-2016, 04:32 PM

I removed mine a couple months ago. Smell seems to be the same. It did add some slight volume and rasp around 3500 RPM. No extra drone. I'll if I can get some sound clips today.

sd306 · 07-17-2016, 02:57 AM

Removal them all

Nothing but gains to be had in the sound and power department.

YouAreMyWorld · 07-18-2016, 06:34 AM

Quote:

Originally Posted by mashimarho

I removed mine a couple months ago. Smell seems to be the same. It did add some slight volume and rasp around 3500 RPM. No extra drone. I'll if I can get some sound clips today.

Sound clips please, would definitely like to hear!

mashimarho · 07-25-2016, 06:24 PM

Quote:

Originally Posted by YouAreMyWorld

Sound clips please, would definitely like to hear!

Sorry, I didn't yet. I will try to this week

CantCatchMe · 07-26-2016, 12:38 AM

Quote:

Originally Posted by mashimarho

Sorry, I didn't yet. I will try to this week

You might not have any drone due to being manual. Us auto guys I'm sure would have some drone. I'll be waiting for your video either way.

JETmn · 07-26-2016, 09:30 AM

Quote:

Originally Posted by CantCatchMe

You might not have any drone due to being manual. Us auto guys I'm sure would have some drone. I'll be waiting for your video either way.

What is the difference between auto and manual for drone? I haven't heard of this before.

CantCatchMe · 07-26-2016, 01:41 PM

Quote:

Originally Posted by JETmn

What is the difference between auto and manual for drone? I haven't heard of this before.

In my past two cars I had one auto and manual in a R56 and the drone was awful in the auto with the Catless DP and secondary cats removed. In my manual it was nonexistent but who knows maybe it didn't help with the Borla I had on the auto and FJCW I had on the manual.

04-24-2016, 01:11 PM	#1
NFrangoulis96 Enlisted Member 6 Rep 31 Posts Drives: 2011 BMW 335xi Coupe MT Join Date: Aug 2014 Location: Greenwich, CT / Portland, ME iTrader: (0) Garage List 2011 BMW 335xi [0.00]	Secondary Cats I've been thinking lately, I'm already running a catless downpipe, why not just get rid of the secondary cats and keep my stock mufflers... Has anyone done this setup? (So it would be whole exhaust is stock except for the removal of the primary and secondary cats)
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04-24-2016, 02:10 PM	#2
fdawg4l 0000000 12 Rep 144 Posts Drives: E90 335i 6MT Join Date: Dec 2010 Location: SF Bay, CA iTrader: (1)	Hell yeah, f#ck the environment and the air you breathe. Moar brap* brah!
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04-24-2016, 02:31 PM	#3
GoCougs Private 2 Rep 50 Posts Drives: 2011 335xi Join Date: Aug 2015 Location: Seattle, WA iTrader: (0)	My secondary cats don't seem to work. I still smell exhaust even though I haven't removed them.
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04-29-2016, 06:15 PM	#5
f87.lci First Lieutenant 34 Rep 328 Posts Drives: 2018 BMW M2- 6MT Join Date: May 2014 Location: Mississauga iTrader: (0)	How much more smell do you get by removing secondary cats if you are already catless ?
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07-14-2016, 11:39 AM	#6
joshe92 Major 88 Rep 1,046 Posts Drives: 2017 F80 M3 Join Date: Mar 2014 Location: Detroit, MI iTrader: (-1)	Where can you buy the T-pipes for secondary cat removal? __________________ 2017 F80 M3 competition Sakhir Orange: // ER catless downpipes, // AA EL midpipe resonated, // MHD tune Retired: E92 335i MSport Sapphire black: // aFe intake // Remus quad // AR Downpipe, Secondary cat delete // MHD // BMW PPK // Alpina B3 Flash // Vrsf 5" Stepped IC & CP
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07-14-2016, 04:32 PM	#9
mashimarho BimmerPost Supporting Vendor 2143 Rep 13,877 Posts Drives: E92 M3 & F80 M3 & G82 M4 Join Date: Mar 2010 Location: Lynnwood, WA iTrader: (45) Garage List 2021 BMW G82 M4 [0.00] 2011 BMW E92 M3 [0.00] 2015 BMW F80 M3 [0.00] 2012 BMW 335i xDrive [9.78]	I removed mine a couple months ago. Smell seems to be the same. It did add some slight volume and rasp around 3500 RPM. No extra drone. I'll if I can get some sound clips today. __________________ Mashimarho.com /// Instagram /// Facebook /// Youtube /// sales@mashimarho.com /// (425) 582-7939
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07-17-2016, 02:57 AM	#10
sd306 Captain 385 Rep 641 Posts Drives: X5 40i Join Date: Sep 2015 Location: USA iTrader: (0)	Removal them all Nothing but gains to be had in the sound and power department. __________________ X5 40i
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