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E60 / E61 (2004 - 2010)
BMW 5-Series E60 Sedan was first seen in the Unites States in the fall of 2003 with a 2004 Model Year designation. The E61 wagon followed shortly there after. The E60/E61 5 series is now available as a 528i, 528xi, 535i, 535xi, 550i and a 535xi sports wagon! -- View the E60 Wiki

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  #1  
Old 02-09-2016, 09:54 PM
wayneious wayneious is offline
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Muffler swap question regarding smog

I'm thinking about changing the muffler out on my E60 and just wondering if anyone here that has done it if you saw an increase is emissions and a potential fail when you did your annual smog check.

With living in CA, I do not enjoy all the smog restriction placed on cars...but I still enjoy the wrench now and again on my car.

Thanks,

Wayneious.
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  #2  
Old 02-10-2016, 02:54 PM
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tim330i tim330i is online now
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The cats are in the heads so anything beyond that is not emissions controlling. You should have no trouble with an exhaust.

Tim
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Old 02-10-2016, 05:12 PM
l1tech l1tech is offline
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Quote:
Originally Posted by tim330i View Post
The cats are in the heads Tim
Say what....I think you better recheck your information
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Old 02-10-2016, 05:28 PM
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tim330i tim330i is online now
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I am willing to admit I could be mistaken but that seems very counter intuitive since BMW has been putting the cats in the headers since the E46 for increased cat warm up times.

EDIT - Cats in the headers - http://www.realoem.com/bmw/enUS/show...diagId=18_0566

To the OP replacing the rear mufflers will for sure not be a problem.

Tim

Last edited by tim330i; 02-10-2016 at 05:30 PM.
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Old 02-10-2016, 07:38 PM
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Bimmer32 Bimmer32 is online now
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Replacing mufflers will not affect emission but it will make your engine sound louder. I replaced mine years ago and put in to turbo mufflers. Absolutely no problem. The goal of the muffler is to muffle the engine exhaust sound or change it.
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Old 02-10-2016, 08:34 PM
l1tech l1tech is offline
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Originally Posted by tim330i View Post
cats in the headers
Your last post said that the cats were in the HEADS but I see you meant to say in the HEADER, quite a bit of difference. Yes BMW does manufacture the cat as part of the exhaust manifold, or what you call header.
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Old 02-11-2016, 12:29 AM
wayneious wayneious is offline
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Thanks Gents,

I'm not worried about a change of sound in the cabin...if needed I will rip the interior out and lay a layer of sound deadeding down.

I did that in a previous vehicle of mine and changed the interior noise level by 7 db at freeway speed.

I'm looking at something that isn't insane in resonance...however I was worried a bit regarding emissions due to the the cars being temperamental in most other aspects of ownership.
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