E46Fanatics - View Single Post - **Everything you need to know about eBay headers**
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Old 05-07-2008, 06:24 AM   #59
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Join Date: Feb 2006
Location: London UK
Posts: 1,234
My Ride: BMW 335i 2007 Coupe
Originally Posted by Owtlaw333 View Post
Why do you need to get cats? As already stated, cats or no cats, getting the headers makes your car illegal in CA. The only reason to get cats is to cut down on noise.
Sadly we're not all in CA. Here in the UK you can use pretty much whatever exhaust system you like, but it's got to pass gas emissions analysis during annual MOT test (there are also roadside spot checks here too) which the OEM cats will. What components you use for the rest of your system, headers, cat-back system, is up to you, although you must have some kind of muffler / silencer, although fairly loud ones are allowed.
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