| 04-23-2019, 09:13 AM | #1 |
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New Member
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ARM cat-less downpipe field report
Fitted the ARM cat-less downpipes to my M550i without a cel and without a tune.
They have these spacers for the secondary o2 sensors and they work. Sound is really better and you can even hear the turbos spooling. Fun times ! |
| 04-23-2019, 11:04 AM | #2 |
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I have the ARM downpipes on my m550i and I have issues with exhaust leaks, do you have similar issues? I noticed them right where the ARM provided clamps connect to the exhaust.
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| 04-26-2019, 04:02 AM | #3 |
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New Member
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Rep 16
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No leaks ... yet.
The fitting was definitely a pain though. The bolt support didn't match up and the angle on the vband wasn't just right and the o2 holes were a bit further in and not aligned to the cover. I'd say with a little quality control these issues could be overcome. |
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| 04-27-2019, 04:13 PM | #4 |
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Captain
 
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Drives: 2019 M550i
Join Date: Aug 2018
Location: Tampa Bay
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do you have any pictures of the stock downpipes? I don't want to run catless so I would like to put a high flow cat in-line.
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| 04-29-2019, 11:51 AM | #5 |
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First Lieutenant
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Had some slight issue with aligning the o2 sensor, other than that they fit fine
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2021 M5 Competition | Imola red
2020 Z4 M40i | Misano blue Pure850/PI/LPFP Gone: 2018 M550i xDrive | DME Tuning BEF / JB4 / BM3 / DPs | 10.95 @ 125 1/4 Mile Gone: 2014 335i xDrive | Bootmod3 Stage 2 93 Map | 12.2 @ 113 1/4 Mile  |
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