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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > NA Engine (non-turbo) / Drivetrain / Exhaust Modifications > Removing Secondary Cats



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      02-14-2008, 01:26 PM   #1
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Removing Secondary Cats

If I were to remove the secondary cats, what effect on sound should I expect to get? Will it be louder? Will there be drone? Will the sound have a "sharper' edge? Sorry to sound like an idiot, but Ive never removed those parts before.
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      02-14-2008, 02:04 PM   #2
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yes it will sound louder...but i dunno if its a good thing... =\

not too sure
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      02-14-2008, 02:24 PM   #3
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i recall ur current set up already has some drone, so I wouldn't recommend doing that.
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      02-14-2008, 02:32 PM   #4
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Hmmm, I see. Whats happened is that over the last 500 miles or so, the exhaust is getting quieter Sometimes I cant even hear it anymore except under hard acceleration. The drone is still there, maybe not as pronounced as before, but the nice sounds are getting quieter as well.
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      02-14-2008, 06:10 PM   #5
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what kind of piping do you have now?

I was told by a guy who is really good with exhausts that removing the secondary cats and putting in x pipes is the way to go. Also seen it backed up here on the forums.
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      02-14-2008, 06:13 PM   #6
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Piping is stock now...
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      02-14-2008, 09:17 PM   #7
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Thats the first I have heard a exhaust getting quieter as it gets broken in!! Maybe you are just getting used to it...I also feel that my CP-E exhaust is getting quieter also...I think its me being adapted and used to the noise now after 2 weeks since the install...
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      02-19-2008, 02:31 AM   #8
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The change of sound is not really that big. There is a "metalic" baritone sound at 2000-3000 (as westwest888 mentioned).

There are some annoying sounds at cold start ,but when you reach the appropriate temperatures its fine.

In general , i would propose you not to delete the secondary ones but replacing them with HFC instead (100s maybe?).
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      02-19-2008, 10:52 AM   #9
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Thanks guys, I will leave them in. Ive already replaced the Corsa with the fake Eisenmann for now.
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