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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 Exhaust mods



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      07-08-2010, 09:11 AM   #1
RyanMv4
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n55 Exhaust mods

Has anyone done any mods to the stock n55 exhausts yet such as muffler/resonator/cat deletes or any combination. I am thinking about going down that path and was wondering if anyone got into doing it yet
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      07-08-2010, 12:06 PM   #2
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No companies yet but you could just go and get one made.
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      07-08-2010, 12:15 PM   #3
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Silly Question, we all know the N54 has a total of 4 cats, how many does the N55 have? I know of 1 after the turbo, but what about 2nd cats?
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      07-08-2010, 12:30 PM   #4
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No companies yet but you could just go and get one made.
Yeah im not really looking to buy an exhaust im thinking more of like a resonator/cat delete
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      07-08-2010, 12:36 PM   #5
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Muffler delete is where its at...
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      07-08-2010, 12:38 PM   #6
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We are *still* looking for an N55 to develop products on!
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      07-08-2010, 12:38 PM   #7
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We are *still* looking for an N55 to develop products on!
I'm up for a drive to colorado...
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      07-08-2010, 12:39 PM   #8
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I'm up for a drive to colorado...
If you're serious, give me a call at the shop, 303 351 3515
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      07-08-2010, 12:40 PM   #9
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I have the whole last week of July off. I'm sure if I left friday I could get there by Saturday.
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      07-08-2010, 07:34 PM   #10
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Anyone have a pic from underneath of the whole exhaust system with the plastic panels removed ?
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      07-09-2010, 10:43 AM   #11
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I do, just came back from Birds today ;]

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      07-09-2010, 10:53 AM   #12
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Ciomas, I can't really tell, but is their only 1 Cat on the N55? I don't see any others on the exhaust system...
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      07-09-2010, 11:04 AM   #13
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there is definitely one on the downpipe, and I would assume there should be 2 additional ones on each side of the exhaust pipes
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      07-09-2010, 11:23 AM   #14
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Thats for the e92 on the sedans i can see two what seem to be smaller secondary cats right before that small crossover but im not sure about a primary one on the downpipe ...
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      07-09-2010, 11:25 AM   #15
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Theres really no giant resonator like the older e90's ... I was planning on doing a res delete but by seeing this there really is no point bc its so small ... any ideas ?
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      07-09-2010, 11:42 AM   #16
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So we are looking at a total of 3 Cats? 1 on the DP, 2 on the exhaust... Ryan, if anything you may want to do a Cat Delete, or get some HFC's to replace the 2nd cats, if your worried about emissions. I know when I get my N55 X5, i most likely will replace the 2nd Cats with HFC's, probably 2-300 cell count... My question is what is the cell count on the 2nd cats? Are they 600 like the N54 cats?
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      07-09-2010, 11:47 AM   #17
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Yeah i guess if theres a primary cat on the downpipe the cat delete is the way to go... Im guessing its the 600 cell count because from what I can see they are the exact same size at the two secondary cats on the n54 exhaust systems ...
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      07-09-2010, 11:56 AM   #18
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If they are the same size, then they are most likely 600 cells... The N54 had a total of 2400 (between the 4 Cats). Does the N55 only have 1800? I'm curious to know what the count is on the main Downpipe Cat. I know i've read that the main cat is larger than what is on the N54, so by that reasoning, It's gotta be a pretty high cell count. I'm probably going to swap my OEM cats back onto my 335 and put the HFC's on the X5 when I get it... It's funny though, that they went with a dual exhaust setup on the N55 considering that it's only one Catted Downpipe coming from the Turbo (split into two outlets) Maybe a Single Exhaust Setup would have been better... IDK
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      07-09-2010, 12:00 PM   #19
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We are *still* looking for an N55 to develop products on!
How about a 335d? :P
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      07-09-2010, 12:08 PM   #20
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Heres a quick pic i just snapped of the two cats on the sedan ...
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      07-09-2010, 12:12 PM   #21
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How about a 335d? :P
Absolutely!
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      07-09-2010, 12:20 PM   #22
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Heres a quick pic i just snapped of the two cats on the sedan ...
Yeah, those bad boys are 600's...
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