03-04-2020, 06:03 PM | #1 |
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Question about secondary downpipes
I am interested in improving the sound/volume of my 19 M5C, and I have seen several exhaust systems I would be interested in. My understanding is that a cat back exhaust system won't add a lot of volume when compared to my current m sport exhaust...so I have a few questions about doing a secondary downpipe with cat deletion:
1) would this make the exhaust significantly louder? 2) I've read that doing this won't trigger a CEL due to lack of O2 sensor, but would it require a tune? 3) what are the chances of this causing a problem that might void the warranty? In other words, would the change in flow etc be enough to say it was the cause of the problem? 4) any suggestions on brands or things to look for? Thanks for the help! |
03-04-2020, 07:38 PM | #2 | |
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If you want to run a stage2 tune then you would want full catless downpipes. If you're just looking for an increase in sound I would go with catback first. Lower DP's will not trigger a CEL but if you take your car in for service they can flag your car for DP's or you have to remove them before you go in and there is no way to tell that you ever had them.
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03-04-2020, 07:59 PM | #3 | ||
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Any recommendations on better sounding/louder cat back systems? I've only heard them on videos, which I don't have a lot of faith in. I'm interested in Akrapovic, but not sure it's worth the price...Armytrix looks interesting...there are others around that price. |
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03-04-2020, 08:12 PM | #4 | |
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03-04-2020, 08:45 PM | #5 | |||
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Armytrix / FI tend to be way louder. Akrapovic is different animal. It is not as loud, but fitment is like a glove and it is lighter than Remus.
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03-04-2020, 08:46 PM | #6 | ||
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03-04-2020, 09:04 PM | #7 | ||||
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03-04-2020, 09:26 PM | #8 |
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That is a major deal breaker. Trust me, as your exhaust gets loud you want that button.
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03-11-2020, 11:07 AM | #10 |
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03-12-2020, 05:20 AM | #11 |
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I asked the folks at my dealership what exhaust mods could be done without causing warranty issues, and I was given a very vague answer. Basically was told that if something malfunctions, it would only be a problem if mods had to be reported...which usually only occurs when there is a third party/extended warranty (I don't have that).
Even if mods are reported, they still have to be proven to have caused the problem to void the warranty, right? Just trying to understand as much as possible because I suspect I will still want secondary downpipes after I get my cat back installed, and I'm not sure how much that would change things...or how that could be proven to cause an issue, should one arise since it doesn't require a tune. |
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03-18-2020, 11:48 PM | #12 | |
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03-19-2020, 10:45 AM | #13 | |
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03-22-2020, 09:15 AM | #14 |
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I was the first with the Remus full cat-back system in Korea.
My installer, who had done many Akra full catback systems for the F90, told me that the Remus is louder than the Akra + secondary DP's. The Remus is deceiving loud. Much louder from the outside than inside the cabin. |
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03-22-2020, 09:43 AM | #15 | |
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03-22-2020, 07:09 PM | #17 |
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03-22-2020, 08:30 PM | #18 |
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Found it. Took 5 min. Will see how it sounds tomorrow
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