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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Remove the cats from my UR catted DP's?



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      07-22-2009, 05:24 AM   #1
Big Tom
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Exclamation 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 05:54 AM.
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      07-22-2009, 08:49 AM   #2
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I'd buy new catless downpipes and sell the catted ones
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      07-22-2009, 08:54 AM   #3
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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
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      07-22-2009, 08:55 AM   #4
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+1, jus get new catless downpipes, save urself the hassle and trouble of gutting them out
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      07-22-2009, 09:10 AM   #5
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Since you're from Europe too I would def buy those DPs off from you. Just pm me if you consider swapping to catless.
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      07-22-2009, 10:35 AM   #6
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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 :-)
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      07-22-2009, 11:54 AM   #7
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Quote:
Originally Posted by enrita View Post
=
I would sell them and get some AR catless if i were you :-)
Now you're talking
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      07-22-2009, 11:55 AM   #8
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AR Design Catless DP's FTW!!
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      07-22-2009, 12:28 PM   #9
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Quote:
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AR Design Catless DP's FTW!!
Quote:
Originally Posted by ar design View Post
Now you're talking
Please just answer my question about the turbulence.
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      07-22-2009, 12:33 PM   #10
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I don't think the turbulence should be an issue as long as you gut properly.
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      07-22-2009, 01:14 PM   #11
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Quote:
Originally Posted by ar design View Post
I don't think the turbulence should be an issue as long as you gut properly.
Ok, thanks for that.
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      07-22-2009, 01:23 PM   #12
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Quote:
Originally Posted by Autobahn335i View Post
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.
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      07-22-2009, 01:32 PM   #13
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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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      07-22-2009, 05:54 PM   #14
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Quote:
Originally Posted by Big Tom View Post
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.
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      07-23-2009, 01:42 AM   #15
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Quote:
Originally Posted by murph-54 View Post
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...
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      07-23-2009, 07:45 AM   #16
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Quote:
Originally Posted by Big Tom View Post
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!
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      07-23-2009, 08:59 AM   #17
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i agree with what she said...
Quote:
Originally Posted by ar design View Post
I don't think the turbulence should be an issue as long as you gut properly.
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