Secondary Cat OR Muffler Delete!?

D.yi · 01-09-2010, 10:33 PM

which should i do why and why not?!

deletedelete · 01-09-2010, 10:53 PM

Those are completely different. One is for sound, the other is for performance. The cat delete can affect your emissions and the muffler delete wont. My muffler delete cost $50 and greatly improves the sound. I didnt want to mess with the cats.

hun77777 · 01-09-2010, 10:57 PM

you should still be able to pass emission test with primary cats in place though...

D.yi · 01-09-2010, 11:01 PM

the secondary cats dont affect emissions tests because they go straight off the obd2. i am going for good sound however i feel like a muffler delete will be way to loud. will a cat delete give me better sound also?

deletedelete · 01-10-2010, 06:46 AM

The muffler delete is loud and has drone from about 1800-2300rpm. I like the louder sound and think it suits my modded car nicely. Its not like its v8 mustang loud or anything.

enrita · 01-10-2010, 07:07 AM

get rid of the secondary cats or even better get catless downpipes.

XPO186 · 01-10-2010, 07:41 AM

No one mentioned that with a muffler delete you are dropping some serious weight off the car... That's definitely good for performance. And remember there are examples of ppl running 11acthe stock catback fully intact.

01-09-2010, 10:33 PM	#1
D.yi Major 52 Rep 1,216 Posts Drives: SB e92 335i Join Date: Oct 2009 Location: SEATTLE iTrader: (0)	Secondary Cat OR Muffler Delete!? which should i do why and why not?! __________________ 07 BSM/Coral e92 335i 6MT
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01-09-2010, 10:53 PM	#2
deletedelete Major General 365 Rep 5,873 Posts Drives: m Join Date: Nov 2008 Location: usa iTrader: (14) Garage List 2013 e92 M3 [0.00] 2011 e93 M3 (sold) [0.00] 2009 335xi (sold) [0.00]	Those are completely different. One is for sound, the other is for performance. The cat delete can affect your emissions and the muffler delete wont. My muffler delete cost $50 and greatly improves the sound. I didnt want to mess with the cats. __________________ ---> Click For xi/xDrive Suspension Compatibility List <---
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01-09-2010, 10:57 PM	#3
hun77777 Brigadier General 198 Rep 4,647 Posts Drives: SG E92 Join Date: Nov 2007 Location: Seattle WA iTrader: (58)	you should still be able to pass emission test with primary cats in place though... __________________ SGE92TT......................... 12.331 Sec @ 117.89 Mph............................POWERED BY l BMS DCI l HELIX IC l FORGE DVs l RR OCC & CP & SCOOPS l AR 3" DPs l AE QUADs l BLISTEIN PSS10 l P3 VENT GUAGE l VISHNU PROCEDE V5 AUTOTUNE l Lots of Window Stickers
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01-09-2010, 11:01 PM	#4
D.yi Major 52 Rep 1,216 Posts Drives: SB e92 335i Join Date: Oct 2009 Location: SEATTLE iTrader: (0)	the secondary cats dont affect emissions tests because they go straight off the obd2. i am going for good sound however i feel like a muffler delete will be way to loud. will a cat delete give me better sound also? __________________ 07 BSM/Coral e92 335i 6MT
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01-10-2010, 06:46 AM	#5
deletedelete Major General 365 Rep 5,873 Posts Drives: m Join Date: Nov 2008 Location: usa iTrader: (14) Garage List 2013 e92 M3 [0.00] 2011 e93 M3 (sold) [0.00] 2009 335xi (sold) [0.00]	The muffler delete is loud and has drone from about 1800-2300rpm. I like the louder sound and think it suits my modded car nicely. Its not like its v8 mustang loud or anything. __________________ ---> Click For xi/xDrive Suspension Compatibility List <---
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01-10-2010, 07:07 AM	#6
enrita Major General 161 Rep 7,377 Posts Drives: 335i - Big turbos Join Date: Sep 2008 Location: Italian in Sweden iTrader: (0)	get rid of the secondary cats or even better get catless downpipes. __________________ 07 335i AT - MOTIV 750 - MHD E85 BMS flash - BMS PI - JB4G5 - Okada Coils - NGK 5992 Plugs - Helix IC - Snow Stg. 3 - Stett CP - Custom midpipes with 100 HJS Cats - Bastuck Quad - PSS10 - QUAIFE LSD - BMS OCC - Forge DVs - AR OC - ALCON BBK - M3 Chassi - Dinan CP - Velocity M rear Toe arms - Advan RZ-DF - LUX H8 - Level 10 AT upgrade
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01-10-2010, 07:41 AM	#7
XPO186 Colonel 128 Rep 2,740 Posts Drives: E92 335i Join Date: May 2007 Location: Albany, NY iTrader: (19)	No one mentioned that with a muffler delete you are dropping some serious weight off the car... That's definitely good for performance. And remember there are examples of ppl running 11acthe stock catback fully intact.
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