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Catted Downpipes + N55 Midpipe (Catless)
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06-17-2013, 02:31 AM | #1 |
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Catted Downpipes + N55 Midpipe (Catless)
Anyone got a setup like this running?
I have a E92 335is and wanted to know if this would be a good idea. I'm already planning to go with catted downpipes somewhere down the road, and understand the pros/cons of it (more expensive, slightly less gains, but less chance of dealership/warranty issues, and most importantly less chance of blown turbo seals), and was curious as to what would be the effects of taking out the secondary cats. Discuss! Last edited by bjf66; 06-17-2013 at 02:38 AM.. |
06-17-2013, 11:48 PM | #2 |
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I heard the 335is with sec cat delete in person and the backfire in between shifts sounds amazing kinda like the new m5
it had the DCT
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06-17-2013, 11:49 PM | #3 |
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Why do you think c@tless down pipes contribute to blown turbo seals? I've never read or heard that anywhere.
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06-17-2013, 11:51 PM | #4 |
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I would keep your secondaries and go catless at the downpipes. Depending on the dealer, you can get questioned for either catted or catless, it's not OEM. Turbo seals would last longer with less backpressure.
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06-17-2013, 11:51 PM | #5 |
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catted or not its still not OEM so they will most likely give you problems.
get cl with dp fix cl dp's will only expose the blown turbo seals more but in no way cause it.
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06-18-2013, 12:13 AM | #6 | |
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Replacing the N54 midpipes with the N55 midpipes will automatically delete the mid catts and exhaust = less backpressure = more flow = more gains I do not want to go "completely cattless" cause of the following possible risks:
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06-18-2013, 02:36 PM | #7 | |||
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Question about installing midpipes; from what I'm aware, our exhaust is one-piece from after DP all the way to the muffler/tips. Did you have to cut the pipes for the Dinan install? What kinda clamps/connections are best for securing the midpipe to the axle-back? |
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06-18-2013, 03:01 PM | #8 | |
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Midpipes: Yes, it's welded to the x-pipe/axle-back sections of this car. He cut his mufflers off and clamped the Dinan mufflers to the existing piping. About the clamps, I know Magnaflow makes nice stainless ones, but as long as it's SS304 metal you should be fine if it's the right size. PS: Catless DP's and stock catted mids create less backpressure than catted DP's and catless mids would, because the "restriction" is further downstream from the turbos. |
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06-18-2013, 06:23 PM | #10 |
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This is true, but it will also reduce exhaust volume a bit more in my experience. I'm also not too much of a fan of the smell, as people can easily tell if you are burning race gas
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06-18-2013, 08:25 PM | #12 | |
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Mine were cut when I had my Dinan axle back exhaust installed, so install of the N55 midpipes will require less labor |
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06-18-2013, 11:21 PM | #13 | ||
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06-19-2013, 12:41 AM | #14 | |
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06-19-2013, 07:57 AM | #16 | |
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http://www.getbmwparts.com/parts/201...=Center%20pipe |
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06-19-2013, 09:41 AM | #17 | |
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06-19-2013, 10:27 AM | #18 | |
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06-19-2013, 11:26 AM | #19 | |
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No one has ever tried this setup of DPs with Highflow Catts and N55 middpipes . So your assertion is more less a theorization, following another theory", rather than facts to quickly conclude less gain results compared to the common bandwagon results Its not just to keep everything looking OEM, it allows us to revert back to the stock without a hassle if needed. |
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06-19-2013, 11:38 AM | #20 | |
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And if you ever need to revert back to stock, you tell me what is more of a hassle. Changing the downpipes or changing the downpipes and mids? The N54 has been out for years. If this was such a good idea, more people would have done it by now. |
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06-19-2013, 11:50 AM | #21 | |
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06-19-2013, 12:49 PM | #22 | |
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I was addressing the midcatt delete in your original post. If you add cattless DP's and do a midpipe delete it would be more of a hassle to have those things welded back on for whatever reason vs doing a swap out The reason no one hasn't done it is because the N55 midpipes didnt exist and only recently found out that you can swap the N55 midpipes with the N54 midpipes for midcatts and mid exhaust delete. People are only going to follow what others do, that's the trend |
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