would you remove cat back for brake service?

tomtom · 09-10-2008, 07:04 AM

i've read mixed comments on this....would they even care because its not engine warranty work...

jtsherri · 09-10-2008, 07:36 AM

I just took my 135i for a new HPFP and didn't take my cp-e cat-back off and haven't gotten any comments from the dealership as of yet. I should have the car back today or tomorrow and will keep you posted.

thegeneral101 · 09-10-2008, 07:41 AM

I spoke directly to the owner of my dealership (a big chicago one) and he said that it was ok to have catback. They really worry about things like intake and engine tune, so you should be ok

gimp2x · 09-10-2008, 08:40 AM

because a catback doesn't do much for performance

1clean335i · 09-10-2008, 10:09 AM

I would leave it on...

Driver72 · 09-10-2008, 01:41 PM

Zero reason to take it off.
If all the cats are in place, you are legal.
And a catback exhaust does not increase boost or do anything to increase ENGINE power, just lets it breathe better (which is where the slight power increase comes from) and if anything it's easier on the engine.

Kitz · 09-10-2008, 02:13 PM

why would you take it off?it's a waste of time..

tomtom · 09-10-2008, 02:17 PM

what about forge diverter valves?...no performance changes.

nissan · 09-10-2008, 04:21 PM

FWIW I recently took my car in w/a tune for new rear brakes + fluid flush and the dealer didn't mind/care/mention it so you should be fine w/just the catback.

jtsherri · 09-15-2008, 11:24 AM

Got my car back on Thurday of next week after having the HPFP replaced and there were no issues with having the exhaust on there... in fact the service guy commented on how good it sounds.

emjei · 09-15-2008, 11:45 AM

Does that include exhaust with the second cats delete ???

Dan335i · 09-15-2008, 04:28 PM

Everything depends on the dealership. I took my 07 335i coupe in for the one year oil change and state inspection.I have a BMS intake and SSTT and left them in.I asked my salesman about the dealers mod policy,and he told me not to worry and leave everything on including the TT as all the techs are into modding.He said if there was a problem that involved something like the ecu or similiar to take out the TT,but i could leave the intake on.He even went in and spoke with the tech that was doing my car about the mods.When done i was talking with three of the techs about how i like the SSTT over the JB tuners that they have on there own cars,etc.

DarrinYuan · 09-15-2008, 04:42 PM

No,I keep my catback and intake with my brake service in the dealer,and they say nothing.

David 12 · 09-15-2008, 11:13 PM

Keep us posted on how it goes tomtom - I am interested in knowing if they try to update your progman!

lauer87 · 09-16-2008, 12:02 AM

I talked to my SA about my cat back exhaust and he said its no problem at all, as long as it truly is secondary cat back.

09-10-2008, 07:04 AM	#1
tomtom Captain 53 Rep 986 Posts Drives: e92 335i Join Date: Jan 2008 Location: ontario iTrader: (4)	would you remove cat back for brake service? i've read mixed comments on this....would they even care because its not engine warranty work... Last edited by tomtom; 09-10-2008 at 08:01 AM..
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09-10-2008, 07:36 AM	#2
jtsherri Major 144 Rep 1,262 Posts Drives: TBD Join Date: Aug 2008 Location: Metro Detroit, MI iTrader: (14) Garage List 2008 135i [10.00]	I just took my 135i for a new HPFP and didn't take my cp-e cat-back off and haven't gotten any comments from the dealership as of yet. I should have the car back today or tomorrow and will keep you posted. __________________ -Jason My review(s): cp-e™ Cat Back Exhaust, cp-e™ SS 3" Downpipes, TPLSM3 Custom Fiberglass Subwoofer Enclosure, P3 BMW 135 Vent Integrated Digital Interface
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09-10-2008, 07:41 AM	#3
thegeneral101 Colonel 76 Rep 2,304 Posts Drives: '15 Z06,'13 750Li,'11 Raptor Join Date: Nov 2006 Location: Miami/Michigan iTrader: (0)	I spoke directly to the owner of my dealership (a big chicago one) and he said that it was ok to have catback. They really worry about things like intake and engine tune, so you should be ok __________________
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09-10-2008, 08:40 AM	#4
gimp2x v81 user 3 Rep 174 Posts Drives: E92 Join Date: Aug 2008 Location: Atlanta, GA iTrader: (0)	because a catback doesn't do much for performance
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09-10-2008, 10:09 AM	#5
1clean335i Perf BMW mag issue 147, 159 414 Rep 6,803 Posts Drives: Project Estoril Join Date: Feb 2007 Location: Miami, FL iTrader: (31) Garage List 2013 335i M-sport [0.00] 2011 X5 xdrive35i M ... [0.00] 2009 335i M-sport [0.00] 07' 335i Sedan [0.00]	I would leave it on... __________________ '13 Estoril Blue 335i M-sport *Don't PM me!* Message me here- http://www.facebook.com/ProjectEstoril
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09-10-2008, 01:41 PM	#6
Driver72 Brigadier General 329 Rep 4,484 Posts Drives: 335i - to new owners now. Join Date: Dec 2006 Location: California iTrader: (0)	Zero reason to take it off. If all the cats are in place, you are legal. And a catback exhaust does not increase boost or do anything to increase ENGINE power, just lets it breathe better (which is where the slight power increase comes from) and if anything it's easier on the engine.
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09-10-2008, 02:13 PM	#7
Kitz Major 75 Rep 1,319 Posts Drives: ex BMW Join Date: Jun 2007 Location: socal 2006-2010, Jakarta 2010+ iTrader: (4)	why would you take it off?it's a waste of time.. __________________ My Baby
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09-10-2008, 02:17 PM	#8
tomtom Captain 53 Rep 986 Posts Drives: e92 335i Join Date: Jan 2008 Location: ontario iTrader: (4)	what about forge diverter valves?...no performance changes.
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09-10-2008, 04:21 PM	#9
nissan Lieutenant 54 Rep 523 Posts Drives: 2015 M6 GC CP Join Date: Mar 2007 Location: DFW iTrader: (4)	FWIW I recently took my car in w/a tune for new rear brakes + fluid flush and the dealer didn't mind/care/mention it so you should be fine w/just the catback.
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09-15-2008, 11:24 AM	#10
jtsherri Major 144 Rep 1,262 Posts Drives: TBD Join Date: Aug 2008 Location: Metro Detroit, MI iTrader: (14) Garage List 2008 135i [10.00]	Got my car back on Thurday of next week after having the HPFP replaced and there were no issues with having the exhaust on there... in fact the service guy commented on how good it sounds. __________________ -Jason My review(s): cp-e™ Cat Back Exhaust, cp-e™ SS 3" Downpipes, TPLSM3 Custom Fiberglass Subwoofer Enclosure, P3 BMW 135 Vent Integrated Digital Interface
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09-15-2008, 11:45 AM	#11
emjei Captain 73 Rep 821 Posts Drives: 08 BMW M3 Coupe Join Date: Apr 2007 Location: Puerto Rico USA iTrader: (3)	Does that include exhaust with the second cats delete ???
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09-15-2008, 04:28 PM	#12
Dan335i Lieutenant Colonel 32 Rep 1,786 Posts Drives: 07 335i coupe 6MT,w/sp. pack. Join Date: Oct 2007 Location: orange county NY iTrader: (2)	Everything depends on the dealership. I took my 07 335i coupe in for the one year oil change and state inspection.I have a BMS intake and SSTT and left them in.I asked my salesman about the dealers mod policy,and he told me not to worry and leave everything on including the TT as all the techs are into modding.He said if there was a problem that involved something like the ecu or similiar to take out the TT,but i could leave the intake on.He even went in and spoke with the tech that was doing my car about the mods.When done i was talking with three of the techs about how i like the SSTT over the JB tuners that they have on there own cars,etc.
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09-15-2008, 04:42 PM	#13
DarrinYuan First Lieutenant 49 Rep 347 Posts Drives: 2016 bmw f80 Join Date: Sep 2007 Location: San Francisco iTrader: (4)	No,I keep my catback and intake with my brake service in the dealer,and they say nothing.
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09-15-2008, 11:13 PM	#14
David 12 Major 129 Rep 1,048 Posts Drives: 2019 BMW X5 50i BSM, M Sport Join Date: Jan 2007 Location: Omaha iTrader: (0)	Keep us posted on how it goes tomtom - I am interested in knowing if they try to update your progman!
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09-16-2008, 12:02 AM	#15
lauer87 Lieutenant 8 Rep 586 Posts Drives: 335xi Join Date: Sep 2007 Location: USA iTrader: (0)	I talked to my SA about my cat back exhaust and he said its no problem at all, as long as it truly is secondary cat back.
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