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      12-23-2018, 11:15 AM   #1
Drew-dale13
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Angry Loud exhaust after MHD

Hey everyone, I’ve been reading on here for quite some time but this is my first post. Recently, i installed MHD tune on my 08 335xi. So far I’ve only used the stock map (since I’m waiting for the spark plugs to come in the mail) but I put the burble on aggressive for 2 seconds just for a couple days to try it out. Even after turning OFF the burble my exhaust is running significantly louder and much more drone and even more burble! (my exhaust always burbled a little before MHD) my exhaust set up is stock cats, secondary cat delete, stock resonator and muffler delete. What could cause my exhaust to be so much louder now??

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      12-23-2018, 11:16 AM   #2
Drew-dale13
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I’m thinking it could be worn out resonator or leak in the exhaust ??
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      12-23-2018, 02:28 PM   #3
colorado.e9x
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Could the tune have possibly fried the cats?
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      12-23-2018, 02:33 PM   #4
Drew-dale13
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Quote:
Originally Posted by Valant View Post
Could the tune have possibly fried the cats?
That's what I thought at first, but there's no weird smells, no smoke, and it drives fine. Also just scanned it and there's no codes. Maybe fried resonator?
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      12-23-2018, 08:41 PM   #5
siphor1989
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do you have the wastegate rattle fix enabled?
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      12-23-2018, 08:44 PM   #6
Drew-dale13
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Quote:
Originally Posted by siphor1989 View Post
do you have the wastegate rattle fix enabled?
I don't. All options on MHD are off right now
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