12-17-2020, 12:02 PM | #1 |
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AA high flow downpipe question
Hi all,
I recently installed an Active Autowerke high flow dp on my OG M2. I also have an MPE with a muffler delete. During the first few days of driving, my car sounded exactly as I had expected. It sounded more throaty and I could hear significantly more of the good noises inside the car. Now 2 weeks later, my car sounds muffled again. I'm simply not hearing the same tone and even sounds muffled despite high load. Just the dreaded drone between 3k-4k. Perhaps it's me getting used to the noise? Could someone maybe enlighten me * (AA does hold their promise of no CEL and the product was built well, so no complaints there) |
12-17-2020, 08:45 PM | #3 |
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12-18-2020, 01:18 AM | #5 |
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12-21-2020, 07:23 AM | #7 |
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If the cat melted, he would get a CEL . I dont think thats the case since he does not have any codes
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12-21-2020, 08:37 AM | #8 |
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Two possibilities and the only way to know for sure is to uninstall and visually check.
Either your cat core melted/physically broke. This would be easy to visually check once uninstalled. Or the inside of your MPE muffler box is damaged in some manner (baffles, packing material, etc) This would be harder to visually verify. Might be able to shake to see if you hear components rattling or snake in a bore scope. Or cut it open. If I recall correctly, this happened to some BMW MPE on various M models so it's certainly in the realm of possibility but you would probably notice rattling or something. Should probably find another owner near you to compare exhaust noise before you go the cutting route. Maybe you're just used to the exhaust note now. |
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12-22-2020, 07:40 AM | #9 | |
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Quote:
If you know someone local with this setup, compare how his car sounds. If not, put the car on a lift an do a visual check
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