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335is with Catted Downpipes Sounds Raspy Above 5K RPM
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10-17-2018, 01:30 PM | #1 |
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335is with Catted Downpipes Sounds Raspy Above 5K RPM
I installed Cobb catted downpipes on my 335is. It sounds great at low rpms and idle, but quickly turns into Civic-like coffee grinder sound at high rpm.
Anyone has dealt with this problem? Will replacing the secondary cats with resonators fix my problem? |
10-17-2018, 01:39 PM | #2 |
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Technically secondary cats already smooth out sound. It may be your axle back actually causing the rasp? Some noises are inherently unavoidable as characteristics of the engine.
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10-18-2018, 03:30 AM | #3 |
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10-18-2018, 08:20 AM | #4 | |
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10-18-2018, 09:20 AM | #5 | ||
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10-18-2018, 09:24 AM | #6 |
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10-19-2018, 03:24 PM | #7 | |
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You will virtually eliminate rasp & drone |
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10-19-2018, 03:36 PM | #8 |
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Make sure to get a 2.5" X pipe. Magma Flow is good X-pipe.
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10-20-2018, 01:10 AM | #9 | |
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Last edited by mawzi; 10-23-2018 at 07:32 PM.. |
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10-20-2018, 01:17 AM | #10 | |
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10-20-2018, 01:18 AM | #11 |
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10-22-2018, 12:01 PM | #12 |
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The sound would get louder and the fumes would smell worse, no?
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10-22-2018, 11:58 PM | #13 |
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Correct to both
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10-23-2018, 07:27 PM | #14 |
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Unfortunately, installing the 1792 resonators in place of secondary cats only reduced the rasp by about 30%.
It introduced a couple of new problems though: -Exhaust smell -Weird vibrating noise at the end of every rev. Not sure if things will change after the car is tuned. It's still stock. Gotta wait till next summer. Before (Only Cobb Catted): After (Cobb Catted + 1792): Last edited by mawzi; 10-23-2018 at 07:53 PM.. |
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10-23-2018, 10:07 PM | #15 | |
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10-23-2018, 10:32 PM | #16 |
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10-23-2018, 10:35 PM | #17 |
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When are you getting the rasp? I did some pills this evening and my setup (which is the same as yours except I'm catless with the MF xpipe) has absolutely no rasp. :/
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10-23-2018, 11:10 PM | #18 |
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10-24-2018, 01:14 AM | #19 | |
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10-24-2018, 10:55 AM | #20 |
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It's gotta be with our iS mufflers, it's such a common problem with downpipes on our platform and the mufflers are really the only difference.
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10-24-2018, 04:29 PM | #22 |
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