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BMW 3-Series (E90 E92) Forum
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Catted Downpipes + N55 Midpipe (Catless)
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06-19-2013, 01:20 PM | #23 |
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I too was under the assumption that people didn't do this setup because:
1. Not many have done it. 2. Costs are much higher. That said, the ability to revert to stock, and use OEM pipes is alluring to me. |
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06-19-2013, 01:41 PM | #24 | |
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06-19-2013, 01:44 PM | #25 |
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All the more reason to get catless downpipes and keep your existing midpipes. If you ever need to go back to stock, you just need to swap out the downpipes. If you get catted downpipes and N55 midpipes and want to go back to stock, you would have to swap the downpipes and midpipes.
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06-19-2013, 03:28 PM | #26 | ||
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Regarding 2, of course it would be, but would also be the exact same with Catted DP's. Nobody was talking about going fully catless when 99% of the gains are in the downpipes. 3, what do you mean didn't exist? N55 mids have been out since the N55 was released, it's an OEM part number for those cars. Before then people just deleted their secondaries which is the same exact thing regarding flow. People have been doing it since 2007. 4, Of course they will when what they are doing is tested and proven to show results. You are in the same group. PS It's catless not cattless. Quote:
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06-19-2013, 07:51 PM | #27 |
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Another question comes to mind.
Let's say I want to be responsible, environmentally friendly, and health conscious. Would the secondary cats be able to do as good of a job at filtering the emissions/noise as primary race cats in a set of aftermarket downpipes? To rephrase: Wouldn't going catted DP and catless midpipes be less noise/smell/emissions than catless DP + OEM catted midpipes? |
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06-19-2013, 08:01 PM | #28 | |
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06-19-2013, 08:20 PM | #29 | |
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06-19-2013, 10:25 PM | #30 | |
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Highflow Catted DPs + N55 midpipes + axle back exhaust is uncharted territory for the N54, so nothing will be known until after it has been done. When the cooler season come back to Florida I should then have this setup with 360 results |
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06-19-2013, 10:45 PM | #31 | |
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06-20-2013, 01:52 AM | #32 | ||
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Never heard of anyone else running similar setup, again my bad. |
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06-20-2013, 09:58 AM | #33 | |
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06-20-2013, 12:40 PM | #35 |
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I have a 335iS and went catless dp's and left midcats alone. Driving normally it doesn't sound much louder, just deeper. WOT sounds insane, however! And cold start is a tad bit on the loud side. I'm very pleased overall with zero sense of exhaust smell
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2013 335iS DCT, Alpine/Saddle JB4, BMS Flash, DCI, RECORD 1/4 JB4/Flash ONLY: 11.9 @118 mph After Dp's installed: 11.57 @120 mph(best trap 121 mph) |
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