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      09-28-2011, 08:06 PM   #1
Shayhurs
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N55 exhaust question

Hey guys. I'm new to the forums and have a coupe of quick questions. I have an N55 335XI coupe and I recently installed AR catted downpipes, The car's still too quite for my taste however. I am looking into this exhaust by Magnaflow:http://www.magnaflow.com/02product/s...ne=all&id=8978. My question is this: Since the XI coupe has secondary cats, will I fail inspection in New York since I assume the exhaust setup I want removes the cats and would leave me with only the high flow cat? Also, what do you guys think of that setup? Thanks for the help.
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      09-28-2011, 09:04 PM   #2
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I don't know the question, but Vanguard is the answer.
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      09-29-2011, 06:13 AM   #3
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Yeah I actually wanted the vanguard exhaust but I was told that it doesn't fit the XI but since I changed my downpipe the ar one with a high flow cat, I'm wondering if I'll still pass inspection if I remove the secondary cats..
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      09-29-2011, 09:21 AM   #4
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Yeah I actually wanted the vanguard exhaust but I was told that it doesn't fit the XI but since I changed my downpipe the ar one with a high flow cat, I'm wondering if I'll still pass inspection if I remove the secondary cats..
If you remove them I'm pretty sure you'd fail like a sniffer. But im pretty sure its all digitally read through obd. So get a tune that deletes codes
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      09-29-2011, 09:55 AM   #5
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Well I have the jb3 stage 1 with OBDII code reader so I think I'm good there, but from what I see the n55 xdrive coupes' only difference is the mid pipe cats. So wouldn't the vanguard exhaust still fit?
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      09-29-2011, 12:25 PM   #6
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Any exhaust that is made to fit with factory downpipes will 100% work with our downpipes. Send me a PM with any exhaust that you are interested in for price quotes.
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      09-29-2011, 02:54 PM   #7
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I can't PM you yet since I haven't made 5 posts But I am interested in either the Vanguard stainless exhaust or the AMS Cat-back.
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      09-29-2011, 08:26 PM   #8
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Quote:
Originally Posted by Shayhurs View Post
Well I have the jb3 stage 1 with OBDII code reader so I think I'm good there, but from what I see the n55 xdrive coupes' only difference is the mid pipe cats. So wouldn't the vanguard exhaust still fit?
It will fit but you have to remove/make another part to make it fit 100%. I forgot what it was, but my installer quoted $500 to install the Vanguard because of that part.

Which is why I went with AE since their exhaust was meant for XI cars. It's getting installed Saturday.
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      09-29-2011, 09:56 PM   #9
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It will fit but you have to remove/make another part to make it fit 100%. I forgot what it was, but my installer quoted $500 to install the Vanguard because of that part.

Which is why I went with AE since their exhaust was meant for XI cars. It's getting installed Saturday.
Sorry might be a noob question but what does AE stand for? Are you referring to the Akrapovic Evolution exhaust?
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      09-29-2011, 10:05 PM   #10
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Sorry might be a noob question but what does AE stand for? Are you referring to the Akrapovic Evolution exhaust?
Autobahn Exotics.
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      09-29-2011, 10:21 PM   #11
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Autobahn Exotics.

Thanks. I just youtubed it and I remember it now by the AE logo. Where did you order it from? It's going to sound sweet!
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      09-29-2011, 11:27 PM   #12
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can somebody help me understand my cars exhaust system...
I know what downpipes are and exhausts, but wth are high flow cats?

If I go AR dp cat'd, would I then have an option of high flow cats?

would it pass smog?
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      09-30-2011, 10:19 AM   #13
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Quote:
Originally Posted by sA x sKy View Post
It will fit but you have to remove/make another part to make it fit 100%. I forgot what it was, but my installer quoted $500 to install the Vanguard because of that part.

Which is why I went with AE since their exhaust was meant for XI cars. It's getting installed Saturday.

Where did you order the AE exhaust from if you don't mind me asking?

Edit: is this the one you're talking about? http://www.**********s.com/AE-Perfor...5i-Exhaust.htm
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      09-30-2011, 10:39 AM   #14
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Quote:
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Where did you order the AE exhaust from if you don't mind me asking?

Edit: is this the one you're talking about? http://www.**********s.com/AE-Perfor...5i-Exhaust.htm
Yeah. I didn't find any videos of it with the n55 so I bit the bullet. I'll make sure to make a video of it.
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      09-30-2011, 10:56 AM   #15
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Quote:
Originally Posted by 335 oClock View Post
can somebody help me understand my cars exhaust system...
I know what downpipes are and exhausts, but wth are high flow cats?

If I go AR dp cat'd, would I then have an option of high flow cats?

would it pass smog?
High Flow Cats are just that. They are catalytic converters designed with less cells to allow for more air flow. They are not as efficient as OEM catalysts, but they do flow considerably better.

As for the option of high flow cats, you have several options depending on brands. Some downpipes only come in catless, and some exhaust systems only come in catless.
Catted downpipes & Catted exhaust
Catted Downpipes & Catless Exhaust
Catless Downpipes & Catted Exhaust
Catless Downpipes & Catless Exhaust

In theory, you should be able to pass emissions even after deleting one set of cats (Either in the dp's, or exhaust), but every car/state is different so no manufacturer can really guarantee that. If you are interested in deleting one set of cats, I would personally get catless downpipes and retain the secondary cats in the exhaust. You will get better flow (Faster spool up, power increase etc) and still should pass emissions.


Quote:
Originally Posted by Shayhurs View Post
I can't PM you yet since I haven't made 5 posts But I am interested in either the Vanguard stainless exhaust or the AMS Cat-back.
I will get some quotes for you. Unfortunately AMS no longer makes an exhaust system for the 335/135. They discontinued it several months ago.
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      09-30-2011, 07:54 PM   #16
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So pissed. My exhaust was delayed by UPS so now I have to wait till Tuesday to get it installed
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      09-30-2011, 08:22 PM   #17
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I actually ordered the ETS exhaust for my car. Really nice looking system.
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      09-30-2011, 09:38 PM   #18
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Quote:
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I actually ordered the ETS exhaust for my car. Really nice looking system.
Nicee. Are you the first to put this on a N55? Can't seem to find any youtube clips for it
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      10-01-2011, 11:48 AM   #19
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Nicee. Are you the first to put this on a N55? Can't seem to find any youtube clips for it
I'm not sure to be honest. I'm thinking so since I cant find a sound clip on an N55 either.
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      10-08-2011, 08:25 PM   #20
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I don't know the question, but Vanguard is the answer.
I just spend the last hour watching youtube videos of the Vanguard V2 exhaust, i'm sold, thanks!
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