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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 downpipe



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      02-15-2011, 01:44 PM   #1
CPWINCH
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N55 downpipe

Do catted aftermarket downpipes have the same gains as non-catted, if so wats the difference. And those running the non catted version on the N55 how is that rotten egg smell since there are no cats.
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      02-15-2011, 01:45 PM   #2
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Catless always has more gains.

And we have em in stock!
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      02-15-2011, 02:01 PM   #3
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The smell isn't as bad as you would expect, not a rotten egg smell at all. I just notice more gas smell at times, not while driving with windows down.

What DP's are you looking at?

iCarbon or AR?
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      02-15-2011, 02:37 PM   #4
AW135iTT
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Quote:
Originally Posted by mineo77 View Post
The smell isn't as bad as you would expect, not a rotten egg smell at all. I just notice more gas smell at times, not while driving with windows down.

What DP's are you looking at?

iCarbon or AR?



+1

I got the icarbon catless ones and the smell isn't bad... Just smell like gas fumes at times and only when the windows are down.
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      02-15-2011, 03:16 PM   #5
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Quote:
Originally Posted by AW135iTT View Post
+1

I got the icarbon catless ones and the smell isn't bad... Just smell like gas fumes at times and only when the windows are down.
+1 for the iCarbon pipes!
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      02-15-2011, 04:00 PM   #6
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The catless smell smells exactly like my '56 ford, it's not bothersome at all.
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      02-15-2011, 04:10 PM   #7
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Are your guys dealerships ok with downpipes?
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      02-15-2011, 04:52 PM   #8
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The smell is really not bad at all, but most of us got use to it I guess!! The only time it smells like eggs is when the 02 sensors go bad, then its smells like the crack of ass!
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      02-15-2011, 05:14 PM   #9
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Quote:
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Are your guys dealerships ok with downpipes?
yep, im in naples and germain bmw has absolutely no problem with it...saying that they are probably the coolest dealer ever. they tend to look over mods
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      02-15-2011, 05:34 PM   #10
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dont know which i want both look incredible, when i see more results and reviews ill be sure to buy one tho
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      02-15-2011, 06:16 PM   #11
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Always better catless, the gases of leak will go out easier
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      02-15-2011, 07:11 PM   #12
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it smells fast
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      02-15-2011, 07:26 PM   #13
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Quote:
Originally Posted by FDfranklin View Post
Are your guys dealerships ok with downpipes?
my dealer is ok with anything except messing in the ECU.
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      02-16-2011, 01:13 PM   #14
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it smells fast
lol
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      02-16-2011, 05:35 PM   #15
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You do smell it when at a light but only when you drive hard or you have wind blowing from behind.. Windows up I havent smelled it yet.

It not horrible but its a very noticable gas smell.

Like someone said it smells fast and I love it
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      02-16-2011, 07:51 PM   #16
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smell isnt bad at all. smells more serious ;P


oh, and AR FTMFW !!!
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      02-22-2011, 01:29 PM   #17
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Quote:
Originally Posted by alexc93 View Post
yep, im in naples and germain bmw has absolutely no problem with it...saying that they are probably the coolest dealer ever. they tend to look over mods
Hmm.. how far is that dealership from Tampa?
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      02-22-2011, 01:44 PM   #18
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Quote:
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Are your guys dealerships ok with downpipes?
Most likely not. But if they're throwing on downpipes anyway, they don't give a f***!
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      02-23-2011, 01:25 AM   #19
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Catless downpipes are always going to yield better performance gains. We are actually running a group buy on the AR Design N55 4" downpipes right now for those of you who are interested in picking up a set!!
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      02-23-2011, 10:11 AM   #20
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Quote:
Originally Posted by **********s.com View Post
Catless downpipes are always going to yield better performance gains. We are actually running a group buy on the AR Design N55 4" downpipes right now for those of you who are interested in picking up a set!!
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      02-26-2011, 08:50 PM   #21
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I spoke with Harold at HP Autowerks and he told me there was only a 4 HP difference from the iCarbon cattless vs. catted. I'm leading towards the catted. The catted ones are high flow and I like the idea of not having to take off my DP for service due to code issues....
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