Secondary cat delete with oem exhaust mod?

gatorfast · 07-26-2012, 09:29 AM

Has anyone done this? How do you like the results? How did it change the sound level and character?

I am not looking for any power, just a slight increase in sound.

1sikbmr · 07-26-2012, 10:20 AM

I gutted my oem secondary cats and had the oem exhaust mod. It was barely louder but definitely more deep in sound.

gatorfast · 07-26-2012, 10:23 AM

Interesting. So were you happy with it overall? Is it worth the effort?

gatorfast · 07-27-2012, 10:24 AM

Anyone else have any input?

duke10 · 07-27-2012, 04:27 PM

What kinda exhaust mod? Straight through like ACM or just the regular style? I got straight through with primary cats delete, secondary replaced with HFC and it's LOUD!

gatorfast · 07-27-2012, 06:07 PM

Just the traditional mod (two large perforated pipes covered). I'm def not interested in messing with the primary cats though.

Trevor .:R · 07-28-2012, 04:24 AM

Heres a video of OEM mod with test pipes sounds like the tits! I want to try it,

It is the best sounding ive ever heard... Goodluck on the future decision !

raywong · 07-28-2012, 09:29 AM

Quote:

Originally Posted by duke10

What kinda exhaust mod? Straight through like ACM or just the regular style? I got straight through with primary cats delete, secondary replaced with HFC and it's LOUD!

But the secondary cats and sport cats are both 180 cel!?

gatorfast · 07-28-2012, 10:14 AM

Trevor the car in the vid sounds amazing! However, straight pipes I'm assuming means replacement of primary cats? Def not interested in that. Just want input on deleting secondary cats and keeping primaries and resonators.

blankstar43 · 07-28-2012, 11:23 AM

Just curious, why don't u want to remove or change the primary cats?

gatorfast · 07-28-2012, 06:31 PM

Quote:

Originally Posted by blankstar43

Just curious, why don't u want to remove or change the primary cats?

Many reasons...think it will be too loud, don't want engine light, etc.

Just looking for a little more volume and was hoping a secondary cat delete would do the trick.

gatorfast · 07-28-2012, 08:24 PM

Quote:

Originally Posted by m3alabama

Did you read my post? HFC is quieter than an ACM mod in every way except HFC is much higher pitched and has no drone.

No CEL with active xpipe which I have.

Yes read your post but not sure what it has to do with what I am asking. I have the traditional 2 pipe oem mod, not the acm version. Also HFC = high flow cats correct? As I stated, I am not interested in messing with my primary cats, just looking for input from anyone who has removed secondary cats and what they thought of the results.

meko · 07-28-2012, 10:09 PM

This...I'm in the same boat. I did the 2 pipe mod and LOVE the sound. Now I'm thinking I'd go for little power, and primary cat delete is the only cat you should be deleting for power because secondary flows well already. Leaving the resonator in place to. Too much sound increase and having to get a tune for CEL is what's holding me back. Not sure if it's all worth it honestly. These cars are plenty fast, I just want the S65 to breathe her best. Anyway, you should either do the primary or don't bother IMO.

raywong · 07-28-2012, 11:43 PM

I have a loud car already, the M3 is my daily car so I don't want it too loud, just want to brighten up the tone, and definitely no drone. I already bought the Evolve tune, haven't decided weather to get the HFC or test pipe yet. HFC are expensive but it should sound just right. Test pipe might be smelly and might be a bit too loud for me. Does anyone know how much louder is the test pipe comparing to HFC?

gatorfast · 07-30-2012, 07:53 AM

Quote:

Originally Posted by meko

Anyway, you should either do the primary or don't bother IMO.

What are you basing this on? Have you done this or heard a before/after with secondary cats removed?

meko · 07-30-2012, 10:05 PM

Sorry I didn't explain fully. The second cat flows very well and the big restriction is the primary. My point was about sound and HP. Too much sound in my opinion with little HP increase. If you were going to mess with it, go with primary. It's your car though.

ElmerBento · 07-30-2012, 10:16 PM

It was barely louder but definitely more deep in sound

gatorfast · 07-31-2012, 08:31 AM

Quote:

Originally Posted by ElmerBento

It was barely louder but definitely more deep in sound

Thanks for the input. Im starting to get the impression that it may not be worth the hassle if there is no noticeable increase in sound.

gatorfast · 08-17-2012, 09:53 AM

Debating taking my car in tomorrow to have secondary cats replaced with straight pipes. Anyone else have any input? Will I notice the sound increase or am I wasting my time?

tibra1 · 08-17-2012, 10:37 AM

I wouldnt do it, OEM mod will drone w/ sec cat delete

dtmwerksm3 · 08-17-2012, 04:44 PM

Turner Test Pipes with stock rear section is a great way to fly, not to loud but sounds amazing WOT and on down shifts, combine that with a tune and you're looking at 40+whp/30+wtq gains.

Just did mine the other week

alpina527 · 08-17-2012, 05:03 PM

I've done the secondary cat delete and am happy with the result.

I would say it's got 5-7% more volume, and sounds slightly more aggressive. No Cel issues or drone at all with the oem rear box.

I have tried different setups before which sound great for a Month, but then they would get on my nerves.

The secondary cat delete gives it a subtle improvement and is worth doing. The cats can easily be smashed out from their housings leaving everything looking standard once welded up again.

07-26-2012, 09:29 AM	#1
gatorfast Major General 4992 Rep 6,860 Posts Drives: 718 Cayman Join Date: Jan 2008 Location: SoFla iTrader: (4)	Secondary cat delete with oem exhaust mod? Has anyone done this? How do you like the results? How did it change the sound level and character? I am not looking for any power, just a slight increase in sound.
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07-26-2012, 10:20 AM	#2
1sikbmr Brigadier General 145 Rep 3,329 Posts Drives: F80 M3 6MT Join Date: Mar 2010 Location: New York iTrader: (16)	I gutted my oem secondary cats and had the oem exhaust mod. It was barely louder but definitely more deep in sound. __________________ F80 ///M3 6MT Avus Blue ZCP
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07-26-2012, 10:23 AM	#3
gatorfast Major General 4992 Rep 6,860 Posts Drives: 718 Cayman Join Date: Jan 2008 Location: SoFla iTrader: (4)	Interesting. So were you happy with it overall? Is it worth the effort?
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07-27-2012, 10:24 AM	#4
gatorfast Major General 4992 Rep 6,860 Posts Drives: 718 Cayman Join Date: Jan 2008 Location: SoFla iTrader: (4)	Anyone else have any input?
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07-27-2012, 04:27 PM	#5
duke10 Private First Class 8 Rep 131 Posts Drives: In between cars Join Date: Jun 2011 Location: Houston, TX iTrader: (1)	What kinda exhaust mod? Straight through like ACM or just the regular style? I got straight through with primary cats delete, secondary replaced with HFC and it's LOUD!
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07-27-2012, 06:07 PM	#6
gatorfast Major General 4992 Rep 6,860 Posts Drives: 718 Cayman Join Date: Jan 2008 Location: SoFla iTrader: (4)	Just the traditional mod (two large perforated pipes covered). I'm def not interested in messing with the primary cats though.
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07-28-2012, 04:24 AM	#7
Trevor .:R Captain 64 Rep 699 Posts Drives: 13 ZCP DCT Join Date: Jan 2011 Location: Thousand Oaks/Camarillo/Westlake iTrader: (1) Garage List 11 M3 [10.00]	Heres a video of OEM mod with test pipes sounds like the tits! I want to try it, It is the best sounding ive ever heard... Goodluck on the future decision ! __________________ Current: 2013 E92 M3 AW DCT Past: 2011 E90 M3 AW DCT, 2011 E92 M3 MR 6MT, 2008 E92 M3 AW 6MT
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07-28-2012, 10:14 AM	#9
gatorfast Major General 4992 Rep 6,860 Posts Drives: 718 Cayman Join Date: Jan 2008 Location: SoFla iTrader: (4)	Trevor the car in the vid sounds amazing! However, straight pipes I'm assuming means replacement of primary cats? Def not interested in that. Just want input on deleting secondary cats and keeping primaries and resonators.
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07-28-2012, 11:23 AM	#10
blankstar43 Lieutenant 52 Rep 596 Posts Drives: 2012 e92 M3 Join Date: Mar 2010 Location: Neverland iTrader: (3)	Just curious, why don't u want to remove or change the primary cats? __________________ 2012 JZB/Fox Red M3 DCT -JZB reflectors, CF gills, gloss black grills
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07-28-2012, 10:09 PM	#13
meko First Lieutenant 177 Rep 387 Posts Drives: E92 M3 - 535i Sport Join Date: Oct 2010 Location: New Jersey iTrader: (3)	This...I'm in the same boat. I did the 2 pipe mod and LOVE the sound. Now I'm thinking I'd go for little power, and primary cat delete is the only cat you should be deleting for power because secondary flows well already. Leaving the resonator in place to. Too much sound increase and having to get a tune for CEL is what's holding me back. Not sure if it's all worth it honestly. These cars are plenty fast, I just want the S65 to breathe her best. Anyway, you should either do the primary or don't bother IMO. __________________
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07-28-2012, 11:43 PM	#14
raywong Private First Class 42 Rep 132 Posts Drives: E92M3 Join Date: Jun 2011 Location: Hong Kong iTrader: (0)	I have a loud car already, the M3 is my daily car so I don't want it too loud, just want to brighten up the tone, and definitely no drone. I already bought the Evolve tune, haven't decided weather to get the HFC or test pipe yet. HFC are expensive but it should sound just right. Test pipe might be smelly and might be a bit too loud for me. Does anyone know how much louder is the test pipe comparing to HFC?
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07-30-2012, 10:05 PM	#16
meko First Lieutenant 177 Rep 387 Posts Drives: E92 M3 - 535i Sport Join Date: Oct 2010 Location: New Jersey iTrader: (3)	Sorry I didn't explain fully. The second cat flows very well and the big restriction is the primary. My point was about sound and HP. Too much sound in my opinion with little HP increase. If you were going to mess with it, go with primary. It's your car though. __________________
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07-30-2012, 10:16 PM	#17
ElmerBento New Member 0 Rep 6 Posts Drives: bmw Join Date: Jul 2012 Location: nice iTrader: (0)	It was barely louder but definitely more deep in sound __________________
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08-17-2012, 09:53 AM	#19
gatorfast Major General 4992 Rep 6,860 Posts Drives: 718 Cayman Join Date: Jan 2008 Location: SoFla iTrader: (4)	Debating taking my car in tomorrow to have secondary cats replaced with straight pipes. Anyone else have any input? Will I notice the sound increase or am I wasting my time?
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08-17-2012, 10:37 AM	#20
tibra1 Banned 127 Rep 6,773 Posts Drives: 2011 ZCP M3 - 2007 335i crashd Join Date: Apr 2009 Location: NYC iTrader: (4)	I wouldnt do it, OEM mod will drone w/ sec cat delete
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08-17-2012, 04:44 PM	#21
dtmwerksm3 Lieutenant 80 Rep 555 Posts Drives: 15 M4 Mineral White/Shakir Join Date: Oct 2011 Location: San Diego, CA iTrader: (0)	Turner Test Pipes with stock rear section is a great way to fly, not to loud but sounds amazing WOT and on down shifts, combine that with a tune and you're looking at 40+whp/30+wtq gains. Just did mine the other week __________________ 2015 BMW M4— Mineral White on Sakhir Orange/Black DCT 2012 BMW S1000RR — Racing Red/Alpine White - Sold 2009 BMW M3 Coupe — Alpine White on Fox Red, DCT - Sold 2003 BMW M3 — Carbon Black on Black, 6MT - Sold 1995 BMW M3 Coupe — Cosmos Black on Black - Sold
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08-17-2012, 05:03 PM	#22
alpina527 Banned 60 Rep 638 Posts Drives: 2008 E92 M3 DCT JZB/FR Join Date: Jan 2010 Location: London, England iTrader: (1)	I've done the secondary cat delete and am happy with the result. I would say it's got 5-7% more volume, and sounds slightly more aggressive. No Cel issues or drone at all with the oem rear box. I have tried different setups before which sound great for a Month, but then they would get on my nerves. The secondary cat delete gives it a subtle improvement and is worth doing. The cats can easily be smashed out from their housings leaving everything looking standard once welded up again.
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