Remove the cats from my UR catted DP's?

Big Tom · 07-22-2009, 06:24 AM

What do you guys think about removing the cats from my catted UR DP's?
Will it work, or will it be even worse due to the turbulence which maybe could appear in the area were the cats was removed from?

I would really like to hear your thoughts about it!

I will soon get a pair of new turbos, so I'm considering doing this at the same time when the DP's is already dismounted.

jpsimon · 07-22-2009, 09:49 AM

I'd buy new catless downpipes and sell the catted ones

TurboBimmer · 07-22-2009, 09:54 AM

Hp difference between catted and catless DP is only 5hp. So I personally wouldn't bother.
Or just sell your catted DPs to me and get catless ones instead

gian335 · 07-22-2009, 09:55 AM

+1, jus get new catless downpipes, save urself the hassle and trouble of gutting them out

TurboBimmer · 07-22-2009, 10:10 AM

Since you're from Europe too I would def buy those DPs off from you. Just pm me if you consider swapping to catless.

enrita · 07-22-2009, 11:35 AM

Noelle Tuner guts the OEM Downpipes with their flash so i guess what we discussed earlier about the sound or turbolence might not really be an issue. Just remembered this now :-)
I would sell them and get some AR catless if i were you :-)

ar design · 07-22-2009, 12:54 PM

Quote:

Originally Posted by enrita

=
I would sell them and get some AR catless if i were you :-)

Now you're talking

Craig@SupremePower · 07-22-2009, 12:55 PM

AR Design Catless DP's FTW!!

Big Tom · 07-22-2009, 01:28 PM

Quote:

Originally Posted by Craig@SupremePower

AR Design Catless DP's FTW!!

Quote:

Originally Posted by ar design

Now you're talking

Please just answer my question about the turbulence.

ar design · 07-22-2009, 01:33 PM

I don't think the turbulence should be an issue as long as you gut properly.

Big Tom · 07-22-2009, 02:14 PM

Quote:

Originally Posted by ar design

I don't think the turbulence should be an issue as long as you gut properly.

Ok, thanks for that.

jtsherri · 07-22-2009, 02:23 PM

Quote:

Originally Posted by Autobahn335i

Hp difference between catted and catless DP is only 5hp.

No offense, but you need to do more homework on this subject. As one adds more mods, the gains between catted vs. non-catted will yield more and more power (especially once custom tunes become commonplace). Even high-flow cats are restrictive and unless you live in a state where they check emissions or you're a bigtime tree hugger (which is fine too), running cats is like throwing money & easy (and significant) power out the window...

As-always, to each their own.

Big Tom · 07-22-2009, 02:32 PM

Better spool up, better throttle response and less heat is three wery important aspects to get rid of the pre-cats.
It's just not only the hp increase...

murph-54 · 07-22-2009, 06:54 PM

Quote:

Originally Posted by Big Tom

Better spool up, better throttle response and less heat is three wery important aspects to get rid of the pre-cats.
It's just not only the hp increase...

Did you go catless after you added the PROcede? Do you track you car? The reason I ask is that I would like to know if there was any change in the oil temps you were running at the track after going catless. I've heard arguments both ways and am hoping to hear from folks that have tunes and track their cars. Thanks.

Big Tom · 07-23-2009, 02:42 AM

Quote:

Originally Posted by murph-54

Did you go catless after you added the PROcede? Do you track you car? The reason I ask is that I would like to know if there was any change in the oil temps you were running at the track after going catless. I've heard arguments both ways and am hoping to hear from folks that have tunes and track their cars. Thanks.

I'm still running catted DP's and I do not track my car.
It's my daily driver...

jtsherri · 07-23-2009, 08:45 AM

Quote:

Originally Posted by Big Tom

Better spool up, better throttle response and less heat is three wery important aspects to get rid of the pre-cats.
It's just not only the hp increase...

Don't forget the wicked-sweet sound!

Craig@SupremePower · 07-23-2009, 09:59 AM

i agree with what she said...

Quote:

Originally Posted by ar design

I don't think the turbulence should be an issue as long as you gut properly.

07-22-2009, 06:24 AM	#1
Big Tom Banned 60 Rep 1,054 Posts Drives: 335i n54 e92 MT Join Date: Mar 2009 Location: Västerås iTrader: (0)	Remove the cats from my UR catted DP's? What do you guys think about removing the cats from my catted UR DP's? Will it work, or will it be even worse due to the turbulence which maybe could appear in the area were the cats was removed from? I would really like to hear your thoughts about it! I will soon get a pair of new turbos, so I'm considering doing this at the same time when the DP's is already dismounted. Last edited by Big Tom; 07-22-2009 at 06:54 AM..
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07-22-2009, 09:49 AM	#2
jpsimon Team Zissou 3200 Rep 10,200 Posts Drives: 2022 AWD M3 Comp - SMB Join Date: Dec 2006 Location: CT iTrader: (7)	I'd buy new catless downpipes and sell the catted ones
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07-22-2009, 09:54 AM	#3
TurboBimmer Lieutenant Colonel 82 Rep 1,616 Posts Drives: F82 M4 Join Date: Mar 2009 Location: Luxembourg iTrader: (5)	Hp difference between catted and catless DP is only 5hp. So I personally wouldn't bother. Or just sell your catted DPs to me and get catless ones instead __________________ Performance Seats, Exhaust, Splitters, Pedals, Steering Wheel / RB Turbos / M3 CF Roof / Brembo GT BBK 355/345 / Rollcage / Forge FMIC / Quaife LSD / Öhlins Road & Track / M3 Suspension Parts / Solid Subframe Bushings / Vorshlag Camberplates / Megan Racing Toe Links / LeatherZ Gauges / Extended M3 DCT Paddles / ER Sports OC / AR OC / Aux Radiator / AR DPs / Alpina TCU / COBB Pro-Tune
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07-22-2009, 09:55 AM	#4
gian335 Major 38 Rep 1,031 Posts Drives: e92 335 Join Date: Apr 2008 Location: uknown iTrader: (1)	+1, jus get new catless downpipes, save urself the hassle and trouble of gutting them out
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07-22-2009, 10:10 AM	#5
TurboBimmer Lieutenant Colonel 82 Rep 1,616 Posts Drives: F82 M4 Join Date: Mar 2009 Location: Luxembourg iTrader: (5)	Since you're from Europe too I would def buy those DPs off from you. Just pm me if you consider swapping to catless. __________________ Performance Seats, Exhaust, Splitters, Pedals, Steering Wheel / RB Turbos / M3 CF Roof / Brembo GT BBK 355/345 / Rollcage / Forge FMIC / Quaife LSD / Öhlins Road & Track / M3 Suspension Parts / Solid Subframe Bushings / Vorshlag Camberplates / Megan Racing Toe Links / LeatherZ Gauges / Extended M3 DCT Paddles / ER Sports OC / AR OC / Aux Radiator / AR DPs / Alpina TCU / COBB Pro-Tune
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07-22-2009, 11:35 AM	#6
enrita Major General 165 Rep 7,377 Posts Drives: 335i - Big turbos Join Date: Sep 2008 Location: Italian in Sweden iTrader: (0)	Noelle Tuner guts the OEM Downpipes with their flash so i guess what we discussed earlier about the sound or turbolence might not really be an issue. Just remembered this now :-) I would sell them and get some AR catless if i were you :-) __________________ 07 335i AT - MOTIV 750 - MHD E85 BMS flash - BMS PI - JB4G5 - Okada Coils - NGK 5992 Plugs - Helix IC - Snow Stg. 3 - Stett CP - Custom midpipes with 100 HJS Cats - Bastuck Quad - PSS10 - QUAIFE LSD - BMS OCC - Forge DVs - AR OC - ALCON BBK - M3 Chassi - Dinan CP - Velocity M rear Toe arms - Advan RZ-DF - LUX H8 - Level 10 AT upgrade
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07-22-2009, 12:55 PM	#8
Craig@SupremePower G.O.A.T.! 1028 Rep 74,992 Posts Drives: '18 GMC Yukon XL Join Date: Mar 2008 Location: New Jersey iTrader: (14)	AR Design Catless DP's FTW!!
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07-22-2009, 01:33 PM	#10
ar design 304 Rep 4,408 Posts Drives: 04 M3 Join Date: Jan 2008 Location: Denver, CO iTrader: (9)	I don't think the turbulence should be an issue as long as you gut properly. __________________ -Critter
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07-22-2009, 02:32 PM	#13
Big Tom Banned 60 Rep 1,054 Posts Drives: 335i n54 e92 MT Join Date: Mar 2009 Location: Västerås iTrader: (0)	Better spool up, better throttle response and less heat is three wery important aspects to get rid of the pre-cats. It's just not only the hp increase...
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