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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Secondary cats delete



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      02-24-2014, 09:16 PM   #1
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Secondary cats delete

Just wondering if anyone has any experience with a secondary cat delete on a stock exhaust. I read a few threads, but wanted more opinions, how much of an affect does it have on sound?
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      02-25-2014, 02:09 AM   #2
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its not a huge difference in sound
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      02-25-2014, 05:55 AM   #3
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I've done mine deleted,and very happy for now, the sound is louderand more distinct.
There is a slight drone between 1500-1800 rpm. But in general I 'm allright with it.

Btw I ve gotcatless dp's aswell!!!
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      02-25-2014, 09:36 AM   #4
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If you're going to do it, replace the secondaries with Vibrant resonators
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      02-25-2014, 01:35 PM   #5
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Quote:
Originally Posted by HighPSI View Post
If you're going to do it, replace the secondaries with Vibrant resonators
What is the purpose of replacing replacing the secondary cats with resonators versus a section of straight pipe? Any pictures and product numbers? Change in sounds/volume?

Thanks!
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      02-25-2014, 03:50 PM   #6
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Quote:
Originally Posted by E92 N54 View Post
What is the purpose of replacing replacing the secondary cats with resonators versus a section of straight pipe? Any pictures and product numbers? Change in sounds/volume?

Thanks!
The purpose is to avoid drone in lower rpm. But for me the sound is all right,and if you are on a highway for a long time, just keep above 2000rpm and it will sound awesome. IMO
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