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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N55 Turbo Engine Tuning and Exhaust Modifications - 335i Tuning > N55 secondary cats?



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      11-14-2010, 08:56 PM   #1
CPWINCH
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N55 secondary cats?

I was reading a thread about catless dps for N55 some one said good luck passing emissions testing because N55 has no secondary cats. To me this sounds wrong but is it true? Does N55 not have secondary cats?
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      11-14-2010, 10:39 PM   #2
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Correct; the N55 has no secondary cats.
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      11-14-2010, 11:11 PM   #3
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We don't test for emissions around these parts...
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      11-14-2010, 11:18 PM   #4
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Quote:
Originally Posted by CPWINCH View Post
I was reading a thread about catless dps for N55 some one said good luck passing emissions testing because N55 has no secondary cats. To me this sounds wrong but is it true? Does N55 not have secondary cats?
N55's have a two stage cat on the down pipe... what I mean is, it's two cats, built into one system... There are no 2nd cats like what you would see on a N54 system... ALthough if you have an N55 335xi it seems like you have some resonators (that look awfully like cats)
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      11-14-2010, 11:18 PM   #5
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Quote:
Originally Posted by shockin330i View Post
We don't test for emissions around these parts...
Ditto. You can run open headers here...
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      11-15-2010, 12:55 AM   #6
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Quote:
Originally Posted by Spoolin View Post
Quote:
Originally Posted by shockin330i View Post
We don't test for emissions around these parts...
Ditto. You can run open headers here...
F'n lucky- I'm jealous.
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      11-15-2010, 01:31 AM   #7
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F'n lucky- I'm jealous.
says the guy with a baller car
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      11-15-2010, 03:39 AM   #8
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Quote:
Originally Posted by shockin330i View Post
says the guy with a baller car


by the way.
downpipes not cats. N55
video from 1er page
http://www.1addicts.com/forums/showthread.php?t=453927


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      11-15-2010, 03:55 AM   #9
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I did see that. I'm waiting on stett to call me so i can take them my car.
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      05-05-2013, 11:08 PM   #10
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Has anyone removed (gutted) half of the cats in the stock n55 down pipe ?
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      05-08-2013, 12:04 AM   #11
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Quote:
Originally Posted by shagandyl View Post
Has anyone removed (gutted) half of the cats in the stock n55 down pipe ?
I've heard of people gutting the whole thing, which works decently but leads to turbulence in the stock pipe's geometry. Haven't heard of half gutting. Honestly, there are such cheap options available now you might as well pick up one of those and save the stock pipe if you need to go back. Besides, you can't fool your nose if your car smells like a go cart. Hollowing out the stock pipe is really just for trying to go stealth or reeealy cheap
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      05-08-2013, 11:26 AM   #12
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Quote:
Originally Posted by shockin330i View Post
We don't test for emissions around these parts...
^ which is one of the VERY few items cool about Florida as well.
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      05-08-2013, 06:41 PM   #13
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I really hope someone figures out a DP fix for the N55.
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      05-08-2013, 10:10 PM   #14
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Quote:
Originally Posted by madmanhiker
Quote:
Originally Posted by shockin330i View Post
We don't test for emissions around these parts...
^ which is one of the VERY few items cool about Florida as well.
.....and other cool things such as legal window tint and beautiful weather...........
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