Loud exhaust after MHD

Drew-dale13 · 12-23-2018, 12:15 PM

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??

Thanks!!

Drew-dale13 · 12-23-2018, 12:16 PM

I’m thinking it could be worn out resonator or leak in the exhaust ??

colorado.e9x · 12-23-2018, 03:28 PM

Could the tune have possibly fried the cats?

Drew-dale13 · 12-23-2018, 03:33 PM

Quote:

Originally Posted by Valant

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?

siphor1989 · 12-23-2018, 09:41 PM

do you have the wastegate rattle fix enabled?

Drew-dale13 · 12-23-2018, 09:44 PM

Quote:

Originally Posted by siphor1989

do you have the wastegate rattle fix enabled?

I don't. All options on MHD are off right now

12-23-2018, 12:15 PM	#1
Drew-dale13 New Member 3 Rep 26 Posts Drives: 2008 335xi Join Date: Apr 2017 Location: North Carolina iTrader: (0)	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?? Thanks!!
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12-23-2018, 12:16 PM	#2
Drew-dale13 New Member 3 Rep 26 Posts Drives: 2008 335xi Join Date: Apr 2017 Location: North Carolina iTrader: (0)	I’m thinking it could be worn out resonator or leak in the exhaust ??
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12-23-2018, 03:28 PM	#3
colorado.e9x eBay Special 3604 Rep 3,174 Posts Drives: E90 330xi Join Date: Feb 2018 Location: Western Slope, Colorado iTrader: (1) Garage List 2006 BMW 330xi [10.00] 2007 BMW 328xi [9.50]	Could the tune have possibly fried the cats? __________________ Common sense is a flower that does not bloom in everyone's garden
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12-23-2018, 09:41 PM	#5
siphor1989 Lieutenant 205 Rep 569 Posts Drives: 2020 m340i xdrive Join Date: May 2015 Location: . iTrader: (3)	do you have the wastegate rattle fix enabled?
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