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      08-28-2011, 02:20 PM   #1
BLKSWAN
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Fully catless vs primary cat delete

Just wondering how much louder the m3 is with all cats removed compared to primary cat delete only. Reason I ask is I\'m trying to decide on whether or not to go challenge race or challenge sport. Thanks in advance for the input.
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      08-28-2011, 02:23 PM   #2
wwjd15
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It depends on your rear exhaust. If running catless with some loud rear session, it will be crazy loud and raspy.
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      08-28-2011, 04:29 PM   #3
BLKSWAN
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If running meistershaft gt as the rear section I'm wondering how much louder it will be.
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      08-28-2011, 05:14 PM   #4
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What about modded stock rear?
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      08-28-2011, 06:41 PM   #5
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Is there an issue of loss of TQ going full catless????
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      08-28-2011, 07:17 PM   #6
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i'd recommend a akra rear section with any full catless or resonated X pipe

good for the street and awesome when you get on it
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      08-28-2011, 07:26 PM   #7
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im debating myself what rear section to use with my challenge sport center section or just leave as is myself.
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      08-28-2011, 09:04 PM   #8
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You will want to keep some set of resonators, going catless won't be an issue. Look at what Borla does along with Dinan, they remove all the cats but have 4 resonators.

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      08-28-2011, 10:26 PM   #9
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I was thinking of throwing in some 200 cell high flow cats on my car, then have ESS do a nice 93 octane tune...would also be curious how loud it would be
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      08-28-2011, 10:42 PM   #10
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my friend had cat less with meisterschaft if u need a sound clip let me know. also i am selling my cat less rpi x pipe. pretty much the same as the challenge race, but you'll get a good price
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      08-29-2011, 08:06 AM   #11
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I'm wondering how much louder the sound will be with the Challenge Race (which has 2 resonators) vs the Sport (which has 2 resonators and 200 cell cats). My friend has Challenge Sport with Meistershaft GT now and it sounds great and I'm trying to decide if going Race will be too loud compared to the sport. If there is not much sound difference, I think I want to go Race.
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      08-29-2011, 08:12 AM   #12
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Catless with a borla xpipe (no cats & 4 resonators) and corsa muffler section and I have absolutely zero drone. I can have a convo in the car at 60mph in 6th gear with ease. WOT is a different story =)
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