Completely Catless w/Stock Muffler?

Pak317 · 03-28-2012, 07:14 PM

I currently have a Fabspeed HFC + X-pipe setup up and was just curious if anyone has tried a completely catless (No primary + Secondary cats) setup with the stock muffler?

Would there even be any significant gains over my HFC + Xpipe setup?

Getting bored with my current setup....

Any info would be appreciated!

spoonf20c · 03-28-2012, 07:32 PM

I'm about to do this, but judging by the few vids i found it kinda sounds funky. kinda raspy but not nice e46m raspy. what do you plan to use for cel? tune or akra delete-r?

GreeKon · 03-28-2012, 08:53 PM

^Yea...what he asked. How would you accomodate for the CEL and OBD readiness?

L4ces · 03-28-2012, 10:01 PM

No cats whatsoever with the stock exhaust... I tried it and it was horrible. It sounded like the muffler was blown out. So much rasp and so unrefined that I couldn't take off from a light without feeling like tasteless moron, bastardizing a classy sports car. I had to shift around 2k just to avoid the obnoxious farty sound that kicks in at 2k.
From outside it didn't sound as bad as it did inside. Inside all I could here was rasp as if the exhaust had no bass or mids.
I was told some people like the sound so you have to try it. Here are my videos. I could not WOT because it would have been too loud and everyone would know it was me.

http://www.youtube.com/watch?v=K460ebaSSS8&feature=youtube_gdata_player

http://www.youtube.com/watch?v=JjvzmmsLLSg&feature=youtube_gdata_player

HighRevM · 03-28-2012, 10:37 PM

CEL def. sounds like shit IMO

Singletrack · 03-28-2012, 10:39 PM

Quote:

Originally Posted by Pak317

I currently have a Fabspeed HFC + X-pipe setup up and was just curious if anyone has tried a completely catless (No primary + Secondary cats) setup with the stock muffler?

Would there even be any significant gains over my HFC + Xpipe setup?

Getting bored with my current setup....

Any info would be appreciated!

Very little difference per the testing that Evolve did on their exhaust. They released all the data, just do a search. They have graphs showing 200CPI cats vs. none...

Also - it will sound farty with the stock muffler...

tibra1 · 03-28-2012, 10:42 PM

As a general rule running catless with stock mufflers sounds terrible..been there

HK8888 · 03-28-2012, 11:08 PM

Quote:

Originally Posted by tibra1

As a general rule running catless with stock mufflers sounds terrible..been there

tibra1 · 03-28-2012, 11:10 PM

Quote:

Originally Posted by HK8888

HK8888 · 03-28-2012, 11:36 PM

Quote:

Originally Posted by tibra1

pbonsalb · 03-29-2012, 06:35 AM

If you run 4 resonators, it sounds fine.

As for significant gains from ditching high flow cats for no cats, I would have to study the dynos. If no cats is worth about 20-25 rwhp, I'll guesstimate that high flow cats drop the gains to 15-20 rwhp.

GreeKon · 03-29-2012, 07:02 AM

Quote:

Originally Posted by tibra1

As a general rule running catless with stock mufflers sounds terrible..been there

General Rule....yes.

BUT...I heard testpipes on a ACM oem modded exhaust and it sounded EPIC.

Pak317 · 03-29-2012, 09:55 AM

Thanks for the replies guys!

As far as the CEL, I'll just buy a tune or try spacers first.

Installing some resonators was an idea that crossed my mind but I think I will go ahead with it and see where it goes. But, if I were to install resonators, will placement of said resonators affect drone/sound?

As far as exhaust, if the OE sounds like shiet, I could always put the AP exhaust back on or just go back to my fabspeed system

Pak317 · 03-29-2012, 09:58 AM

Quote:

Originally Posted by Singletrack

Very little difference per the testing that Evolve did on their exhaust. They released all the data, just do a search. They have graphs showing 200CPI cats vs. none...

Also - it will sound farty with the stock muffler...

Thanks, i'll have to search for their data

Raptor251 · 03-29-2012, 12:01 PM

Worst sound out there unless you are quad resonated

tibra1 · 03-29-2012, 04:51 PM

Quote:

Originally Posted by GreeKon

General Rule....yes.

BUT...I heard testpipes on a ACM oem modded exhaust and it sounded EPIC.

Ahh!..But that is not a stock muffler..thats in essence a straight pipe setup

Pak317 · 03-29-2012, 05:52 PM

Quote:

Originally Posted by Raptor251

Worst sound out there unless you are quad resonated

I'll just have to try it in steps! I plan on leaving the oe resonators on and then go from there.

BroderickMi · 03-30-2012, 02:24 AM

I tried it and it was horrible. It sounded like the muffler was blown out.

03-28-2012, 07:14 PM	#1
Pak317 Private Drives: 08 AW E92 M3 Join Date: May 2010 Location: WA Posts: 69 iTrader: (0)	Completely Catless w/Stock Muffler? I currently have a Fabspeed HFC + X-pipe setup up and was just curious if anyone has tried a completely catless (No primary + Secondary cats) setup with the stock muffler? Would there even be any significant gains over my HFC + Xpipe setup? Getting bored with my current setup.... Any info would be appreciated!
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03-28-2012, 07:32 PM	#2
spoonf20c let me see you become a ///Monster Drives: E92 Join Date: May 2009 Location: SloCal Posts: 314 iTrader: (12)	I'm about to do this, but judging by the few vids i found it kinda sounds funky. kinda raspy but not nice e46m raspy. what do you plan to use for cel? tune or akra delete-r? __________________
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03-28-2012, 10:37 PM	#5
HighRevM First Lieutenant Drives: E90 M3 Join Date: May 2011 Location: SoCal Posts: 331 iTrader: (1)	CEL def. sounds like shit IMO __________________ E90 6mt Jerez
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03-29-2012, 09:55 AM	#13
Pak317 Private Drives: 08 AW E92 M3 Join Date: May 2010 Location: WA Posts: 69 iTrader: (0)	Thanks for the replies guys! As far as the CEL, I'll just buy a tune or try spacers first. Installing some resonators was an idea that crossed my mind but I think I will go ahead with it and see where it goes. But, if I were to install resonators, will placement of said resonators affect drone/sound? As far as exhaust, if the OE sounds like shiet, I could always put the AP exhaust back on or just go back to my fabspeed system __________________ Mods: Fabspeed HFC + X-Pipe/Agency Power Exhaust
	0

03-30-2012, 02:24 AM	#18
BroderickMi New Member Drives: aodi Join Date: Mar 2012 Location: gou Posts: 8 iTrader: (0)	I tried it and it was horrible. It sounded like the muffler was blown out. __________________
	0

03-28-2012, 08:53 PM	#3
GreeKon It ain't gonna suck itself Drives: 2010 M3 Join Date: Jan 2012 Location: Philadelphia, PA Posts: 602 iTrader: (1)	^Yea...what he asked. How would you accomodate for the CEL and OBD readiness?
	0

03-28-2012, 10:01 PM	#4
L4ces Captain Drives: 2008 E92 M3 Alpine White Join Date: Aug 2010 Location: Nj Posts: 637 iTrader: (0) Garage List 2008 M3 [0.00]	No cats whatsoever with the stock exhaust... I tried it and it was horrible. It sounded like the muffler was blown out. So much rasp and so unrefined that I couldn't take off from a light without feeling like tasteless moron, bastardizing a classy sports car. I had to shift around 2k just to avoid the obnoxious farty sound that kicks in at 2k. From outside it didn't sound as bad as it did inside. Inside all I could here was rasp as if the exhaust had no bass or mids. I was told some people like the sound so you have to try it. Here are my videos. I could not WOT because it would have been too loud and everyone would know it was me. http://www.youtube.com/watch?v=K460ebaSSS8&feature=youtube_gdata_player http://www.youtube.com/watch?v=JjvzmmsLLSg&feature=youtube_gdata_player
	0

03-28-2012, 10:42 PM	#7
tibra1 Banned Drives: 2011 ZCP M3 - 2007 335i crashd Join Date: Apr 2009 Location: NYC Posts: 6,777 iTrader: (4)	As a general rule running catless with stock mufflers sounds terrible..been there
	0

03-29-2012, 06:35 AM	#11
pbonsalb Major Drives: 08 E90 M3, 99 E36 M3 Turbo Join Date: Feb 2011 Location: Concord, NH Posts: 1,411 iTrader: (3)	If you run 4 resonators, it sounds fine. As for significant gains from ditching high flow cats for no cats, I would have to study the dynos. If no cats is worth about 20-25 rwhp, I'll guesstimate that high flow cats drop the gains to 15-20 rwhp.
	0

03-29-2012, 12:01 PM	#15
Raptor251 ESS Dreaming Drives: 2011.5 e92 m3/Ford Raptor 6.2 Join Date: Jan 2011 Location: San Diego Posts: 870 iTrader: (1)	Worst sound out there unless you are quad resonated
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