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Stainless vs. stainless
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Posted by ELaw [Email] (#699) [Profile/Gallery] (more from ELaw) on Wed, 11 Mar 2015 06:55:41 Share Post by Email
In Reply to: Newer Audis come with stainless exhaust - standard, Bill Homer [Profile/Gallery] , Tue, 10 Mar 2015 14:54:04
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I think her car (an '04 A4 quattro) came with stainless from the factory, and the OE replacement system is stainless.

The good news is that OE stainless systems are 400-series stainless which lasts a heck of a lot longer than regular steel. The bad news is it's not the same as most people think of as "stainless" like a kitchen sink, which is usually 304 stainless which is much more corrosion-resistant.

Here in New England the 400-series stuff has a lifetime of about 10 years if used in the winter. I've got a catback system on my 9000 which is 400-series, it's about 12 years old (two of those years were spent in FL), and is close to needing replacement. I've also got some 304 stainless parts on that car and I expect them to last forever.

I think some aftermarket systems claim to be made of 304 stainless, but I'm skeptical of whether they're *entirely* made of 304. Sometimes the pipes will be 304 but the mufflers will be 409, and so on.

Here's a photo:

Pipe on the left side is 304 stainless, on the right it's 409. They're the same age.

->Posting last edited on Wed, 11 Mar 2015 07:12:29.
_______________________________________
Eric Law

Current collection:
'12 Audi A4 quattro (self-tuned)
'14 Audi A6 quattro (also self-tuned)

Gone but not forgotten:
 '72 99, '77 99 (became a turbo, twice)
 '80 900T 5-door, '81 900T, '86 900S (became a turbo), '86 900 SPG
 '86 9000, '97 9000 Aero
 A bunch of Audis, '69 Firebird, '64 Toyota Corona (first car, cost $35 and worth every penny)

Be alert... America needs more lerts!
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