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E24 (1976 - 1989)
The BMW 6 Series (E24) was the first variant of the 6 series produced by BMW from 1976 through 1989.

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  #1  
Old 06-03-2012, 06:18 AM
anton008 anton008 is offline
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Location: Richland,Missouri
 
Join Date: May 2011
Posts: 18
Mein Auto: 1989 635csi
Exhaust Questions

Hey guys, I'm in the middle of a budget build on a 88 635. Just got all the parts for the 5 speed swap and am trying to layout a plan for the exhaust. I'm going to try to change as much of the stock system I can, But my question is... has anybody experimented with removing the cat. and how does it affect the o2 sensors. I have been doing some research and the euro models didnt have one and therefore had a little more power and from what I read, ran alittle better. My brother did a build putting a non vanos m50 into his 87 e30, when he did his exhaust somethings up with the cat and makes this crazya** sound, probably a shot baffle? Just trying to avoid this from happening. Any help is great!! Thanks
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  #2  
Old 06-04-2012, 11:32 AM
Limarxy Limarxy is offline
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Location: bellevue
 
Join Date: Jul 2011
Posts: 69
Mein Auto: 2002 bmw 530 1985 bmw 635
i replaced my cat with magnaflow cat universal and 3 inch single pipe cat back and 6x18 magnaflow muffler and dual tipps. warning a bit too loud. more then i wanted it
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  #3  
Old 06-04-2012, 06:08 PM
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rmorin49 rmorin49 is offline
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Mein Auto: 2011 335d
My B&B Triflow with a cat is just about right. I thought about removing the cat but have not done so yet.
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  #4  
Old 06-04-2012, 07:26 PM
anton008 anton008 is offline
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Location: Richland,Missouri
 
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Mein Auto: 1989 635csi
So when replacing the cat. Did they come pre drilled for o2 sensor or did you have to drill it? My sensors in the cat.
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