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BMW 3-Series (E90 E92) Forum
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A closer look at the N55 (a tear down)
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09-01-2010, 03:15 AM | #45 |
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09-01-2010, 08:18 AM | #46 | |
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this also means someone could put the N55 exhaust on an N54 car...with no more secondary cats in the i models, it could be a cheap way to upgrade to a more free flowing factory exhaust. |
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09-01-2010, 08:23 AM | #47 |
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Amazing! Props to Matt & the crew @ Camber Toe. I trust Matt & crew to do work on all my cars !!
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09-01-2010, 10:34 AM | #48 |
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Yup, that's where a test pipe comes in...
Matt, Is a test pipe in the works as we speak? A test pipe would really open up the exhaust. An EVO IX with an intake, header, test pipe, and a tune really turns it to a different animal. A lot of EVO owners would know that's a fact. I know it may not be easy, but try applying the same thing to the N55... |
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09-01-2010, 11:18 AM | #49 | |
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09-01-2010, 11:33 AM | #50 | |
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However, there might be drawbacks when the cat is deleted: 1) Maybe too loud for some. 2) The cat should be re-installed when it's time for a smog check. |
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09-01-2010, 07:54 PM | #52 |
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thanks Matt - this is a great thread. thanks!!!
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09-01-2010, 09:17 PM | #54 | |
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09-02-2010, 11:58 AM | #55 | |
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09-07-2010, 09:09 AM | #57 | |
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09-11-2010, 02:07 PM | #59 |
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Well according to Shiv on another post, these turbos are going to be good for about a max of 390hp. Any idea if we can start upgrading these turbos? I'm gonna need more than 390whp...
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09-13-2010, 11:40 AM | #60 |
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like the hpf version?
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09-13-2010, 12:53 PM | #63 | |
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I see your point about clearance. You could always try to oval the pipe a bit to maintain the same area with a smaller vertical dimension. As long as it's not too extreme, it won't have a huge effect on backpressure. It's primarily a question of flow area. The biggest gain will be just replacing/removing that huge catalytic converter. The pipe sizes/arrangements past that will be insignificant compared to a high flow cat or none at all.
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09-13-2010, 03:13 PM | #64 | |
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09-13-2010, 03:33 PM | #65 | |
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ALthough it has been shown that there are either resonators or cats on the 335 x-drive's... (did anyone confirm whether those were cats or resonators on the x-drives'?) I know on the N55 X5, there are no other cats or resonators after the DP.
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09-13-2010, 04:27 PM | #66 | |
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How you do the piping downstream of that isn't going to matter nearly as much...
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