M3 catless ?

e.n335 · 05-04-2010, 12:43 PM

Hi,

I refer to PG, he gained about 8 bhp / whp ? by deleting the catalysts ( all ). This is based on his dyno's. Is this really worth the hassle and the money ? Please post your opinions here.

Thanks,
Eugen

DevJ · 05-04-2010, 02:02 PM

Quote:

Originally Posted by e.n335

Hi,

I refer to PG, he gained about 8 bhp / whp ? by deleting the catalysts ( all ). This is based on his dyno's. Is this really worth the hassle and the money ? Please post your opinions here.

Thanks,
Eugen

IMO, if you delete the cats it smells like a go cart. If you want the most power and don't mind the smell and don't have inspections go for it. If you do mind the smell and you have inspections quite often, don't go catless.

isugoo · 05-04-2010, 02:36 PM

I've had Dinan stage 3 E46 M3 and now most of bolt-on modded Dinan E90M3.
This is very first time running my car w/o cats (Dinan midpipe) and I never felt that much power gain from single mod (I personally don't like any SC or Turbo mods-I'm a fan of N/A engine).

Power?
Def. worth it.

Smell?
Yes- it's there but kinda got used to it but I still hate the smell.

Inspection/Emission?
I know I'll be in trouble so need to put stock backon when time comes but I don't need one till 2013 so I don't worry too much.

Green factor?
Admit- it's very selfish and irresponsible.

Overall impressions?
It's the damn power that I enjoy most and can't give up.

Fen335i · 05-04-2010, 02:45 PM

Quote:

Originally Posted by e.n335

Hi,

I refer to PG, he gained about 8 bhp / whp ? by deleting the catalysts ( all ). This is based on his dyno's. Is this really worth the hassle and the money ? Please post your opinions here.

Thanks,
Eugen

Dinan claims 22whp w/their catless setup...I believe other tuners offering similar products claim about the same. Even upgraded xpipes w/HFC's are getting 12-20whp. You add a tune to that and you should get another 9-15whp

mixja · 05-04-2010, 11:45 PM

Doing the primary cat delete only in my car definitely has netted more than 8WHP. I think more like 20WHP and a whole lot more torque.

Definitely recommend the primary cat delete only, no smell issues and retain that stock OEM exhaust sound.

H Bomb · 05-05-2010, 12:11 AM

+1 except i don't think the smell is that bad at all

Quote:

Originally Posted by isugoo

I've had Dinan stage 3 E46 M3 and now most of bolt-on modded Dinan E90M3.
This is very first time running my car w/o cats (Dinan midpipe) and I never felt that much power gain from single mod (I personally don't like any SC or Turbo mods-I'm a fan of N/A engine).

Power?
Def. worth it.

Smell?
Yes- it's there but kinda got used to it but I still hate the smell.

Inspection/Emission?
I know I'll be in trouble so need to put stock backon when time comes but I don't need one till 2013 so I don't worry too much.

Green factor?
Admit- it's very selfish and irresponsible.

Overall impressions?
It's the damn power that I enjoy most and can't give up.

schnell325 · 05-05-2010, 01:45 AM

Quote:

Originally Posted by DevJ

IMO, if you delete the cats it smells like a go cart. If you want the most power and don't mind the smell and don't have inspections go for it. If you do mind the smell and you have inspections quite often, don't go catless.

My thoughts too.

Being catless, there's a movie quote I think of at each start up:
"I love the smell of napalm in the morning"

biglare · 05-05-2010, 01:55 AM

I received my dinan exhaust at time of delivery. After about 1500 miles I ordered the dinan mid-pipes. Once they were installed I noticed a significant power increase, based on my butt dyno. I did not get the car dyno'd before and after, but my butt dyno could definitely feel the difference.

Of course all of this was done prior to be getting the S/C. Also, I love the deep tones at low rpm and the screaming at WOT. I think the cat-less setup is worth it for more power and the added sound tones.

schnell325 · 05-05-2010, 02:05 AM

Absolutely correct.

Fen335i · 05-05-2010, 01:18 PM

Quote:

Originally Posted by schnell325

My thoughts too.

Being catless, there's a movie quote I think of at each start up:
"I love the smell of napalm in the morning"

too funny...and one great movie! And a great line....

Dodge2Dub · 05-26-2011, 01:26 AM

Quote:

Originally Posted by biglare

I received my dinan exhaust at time of delivery. After about 1500 miles I ordered the dinan mid-pipes. Once they were installed I noticed a significant power increase, based on my butt dyno. I did not get the car dyno'd before and after, but my butt dyno could definitely feel the difference.

Of course all of this was done prior to be getting the S/C. Also, I love the deep tones at low rpm and the screaming at WOT. I think the cat-less setup is worth it for more power and the added sound tones.

Larry, how was the smell?? Horrid or okay? Basically, when I start the car in my garage with the door open, will the smell make my eyes water?

Btw, nice meeting you tonight!

niqui · 05-26-2011, 09:06 AM

my car reeks. following me would give me a migraine...but as the driver u only really smell it on abrupt stops, reverse, garages, etc...
otherwise its fun and highly ungreen.

Mark's M · 05-26-2011, 09:25 AM

Quote:

Originally Posted by Dodge2Dub

Larry, how was the smell?? Horrid or okay? Basically, when I start the car in my garage with the door open, will the smell make my eyes water?

Btw, nice meeting you tonight!

Let me jump in for a moment for my .02 on the smell issue. I don't like it. In the garage it is overpowering at times. I love the power, love the sound of my full Dinan system but I'm re-thinking how I'm going to handle the smell. On a warm, still day with the windows down and stopped at a light or similar, it gets into the car occasionally. When moving forward, it's fine. Don't know what to do. I'm a snowmobiler and can't get enough of good 'ol 2-stroke fumes so I'm no prude when it comes to this kind of shit. But the M3 isn't a snowmobile and I expect better. Going to the track pretty soon and maybe I'll get over it. We'll see. Hope that helps.

Mark

Draff1 · 05-26-2011, 09:26 AM

I think many use PG's dyno charts as a benchmark so kudos to him. I've quoted his dyno charts myself but I think 8WHP is something I would challenge for going catless. Reputable firms all quote 3 times as much HP are they lying? Doubt it.

If it really is 8HP, it's absolutely NOT worth it. Considering the cost of an x-pipe, emissions implications, legal implications and warranty issues, it's barely worth it at 25WHP. Sound is subjective and depends greatly on the rear section and the combination of Xpipe.

05-04-2010, 12:43 PM	#1
e.n335 Moderator 270 Rep 4,481 Posts Drives: e93 ///M3 DCT, 07/2009 Join Date: Feb 2007 Location: Switzerland, ZH iTrader: (0)	M3 catless ? Hi, I refer to PG, he gained about 8 bhp / whp ? by deleting the catalysts ( all ). This is based on his dyno's. Is this really worth the hassle and the money ? Please post your opinions here. Thanks, Eugen
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05-04-2010, 02:36 PM	#3
isugoo Major General 248 Rep 6,125 Posts Drives: 991.2 GTS Join Date: Feb 2008 Location: Irvine, CA iTrader: (73)	I've had Dinan stage 3 E46 M3 and now most of bolt-on modded Dinan E90M3. This is very first time running my car w/o cats (Dinan midpipe) and I never felt that much power gain from single mod (I personally don't like any SC or Turbo mods-I'm a fan of N/A engine). Power? Def. worth it. Smell? Yes- it's there but kinda got used to it but I still hate the smell. Inspection/Emission? I know I'll be in trouble so need to put stock backon when time comes but I don't need one till 2013 so I don't worry too much. Green factor? Admit- it's very selfish and irresponsible. Overall impressions? It's the damn power that I enjoy most and can't give up. __________________ PAST: F80 M3 ZCP \| 911.1 C2S \| F10 M5 ZCP \| E70 X5M \| E90 M3 \| E46 M3 \| E36 M3
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05-04-2010, 11:45 PM	#5
mixja Captain 50 Rep 780 Posts Drives: 2011 E90 DCT Silverstone Join Date: Jun 2008 Location: Beverly Hils, CA iTrader: (1)	Doing the primary cat delete only in my car definitely has netted more than 8WHP. I think more like 20WHP and a whole lot more torque. Definitely recommend the primary cat delete only, no smell issues and retain that stock OEM exhaust sound.
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05-05-2010, 01:55 AM	#8
biglare Bulldog 482 Rep 3,355 Posts Drives: BMW & Porsche Join Date: May 2008 Location: ? iTrader: (3)	I received my dinan exhaust at time of delivery. After about 1500 miles I ordered the dinan mid-pipes. Once they were installed I noticed a significant power increase, based on my butt dyno. I did not get the car dyno'd before and after, but my butt dyno could definitely feel the difference. Of course all of this was done prior to be getting the S/C. Also, I love the deep tones at low rpm and the screaming at WOT. I think the cat-less setup is worth it for more power and the added sound tones. __________________ Prev: Individual F80 M3 - Fjord Blue/Silverstone(interior) \| Fashion Grey(exterior) GTS
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05-05-2010, 02:05 AM	#9
schnell325 Bored at work.... 890 Rep 5,391 Posts Drives: 2016 F82 M4 GTS//2022 M235iGC Join Date: Aug 2007 Location: Comox Valley iTrader: (8)	Absolutely correct. __________________ Grey Matter:2008 E92 M3:608/425. SG/PS SOLD! Dark Matter:2015 F80 M3:495/505. SOLD! Anti Matter :2016 F82 M4 GTS What next?!? A 2022 M235i GC- I must be getting old
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05-26-2011, 09:06 AM	#12
niqui Brigadier General 127 Rep 3,110 Posts Drives: Jet Black E92 M3 Join Date: Feb 2009 Location: Canada iTrader: (7)	my car reeks. following me would give me a migraine...but as the driver u only really smell it on abrupt stops, reverse, garages, etc... otherwise its fun and highly ungreen. __________________ Jet Black E92 M3
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05-26-2011, 09:26 AM	#14
Draff1 Private First Class 13 Rep 195 Posts Drives: 2009 Silverstone M3 Coupe Join Date: Aug 2009 Location: San Diego, CA iTrader: (0)	I think many use PG's dyno charts as a benchmark so kudos to him. I've quoted his dyno charts myself but I think 8WHP is something I would challenge for going catless. Reputable firms all quote 3 times as much HP are they lying? Doubt it. If it really is 8HP, it's absolutely NOT worth it. Considering the cost of an x-pipe, emissions implications, legal implications and warranty issues, it's barely worth it at 25WHP. Sound is subjective and depends greatly on the rear section and the combination of Xpipe. __________________ 2009 Silverstone II E92 M3 Coupe - DCT Dinan Exhaust, RPi scoops, Dinan Tune, Dinan Pulley, BMC filter, LCI Taillights, MS 15mm spacers, Huper Optik tint.
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