Removed Secondary Cats

UCF 335 · 03-30-2011, 06:03 PM

Today I removed my secondary cats but I hear no difference in sound on my car (e90).

If I take the muffler off with the cats deleted is it going to sound bad? My setup would be stock downpipes --> no sec cats --> resonator --> no mufflers.

I looked on here and youtube for clips on an e90 of muffler deletes and found a few but all had secondary cats still in tact.

bulldog_yyc · 03-30-2011, 07:00 PM

take the resonator off next, leave the mufflers on

PiZauL · 03-30-2011, 07:49 PM

I removed my secondary cats and noticed a big difference. In the process of making a thread with some vids and pics.

IMO, no mufflers is WAY too loud on these cars. I have been battling myself trying to figure out what I was going to do to the stock exhaust and concluded the 2nd cat delete was the best bet. I met up with a member and heard his muffler delete, which aided in my final decision as it was too loud.

03-30-2011, 06:03 PM	#1
UCF 335 Second Lieutenant 14 Rep 242 Posts Drives: Monaco 335i Sedan Join Date: Apr 2008 Location: Jax, FL iTrader: (2)	Removed Secondary Cats Today I removed my secondary cats but I hear no difference in sound on my car (e90). If I take the muffler off with the cats deleted is it going to sound bad? My setup would be stock downpipes --> no sec cats --> resonator --> no mufflers. I looked on here and youtube for clips on an e90 of muffler deletes and found a few but all had secondary cats still in tact.
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03-30-2011, 07:00 PM	#2
bulldog_yyc Major General 136 Rep 5,040 Posts Drives: GT3RS Join Date: Oct 2008 Location: probably work iTrader: (28)	take the resonator off next, leave the mufflers on
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03-30-2011, 07:49 PM	#3
PiZauL I6 + TT = FTW 126 Rep 867 Posts Drives: E90 M3, GT350, Tesla M3P Join Date: Jan 2010 Location: Baltimore, MD iTrader: (2)	I removed my secondary cats and noticed a big difference. In the process of making a thread with some vids and pics. IMO, no mufflers is WAY too loud on these cars. I have been battling myself trying to figure out what I was going to do to the stock exhaust and concluded the 2nd cat delete was the best bet. I met up with a member and heard his muffler delete, which aided in my final decision as it was too loud.
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