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Stainless vs. stainless Posted by ELaw [Email]  (#699)  [Profile/Gallery]
(more from ELaw) on Wed, 11 Mar 2015 06:55:41
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:
_______________________________________ 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!
, Mon, 9 Mar 2015 08:56:01, Mon, 9 Mar 2015 13:55:04, Mon, 9 Mar 2015 19:09:16
, Tue, 10 Mar 2015 08:37:00, Wed, 11 Mar 2015 06:57:13, Tue, 10 Mar 2015 10:18:16, Tue, 10 Mar 2015 13:02:18, Tue, 10 Mar 2015 11:55:22, Tue, 10 Mar 2015 12:18:33, Tue, 10 Mar 2015 14:54:04, Wed, 11 Mar 2015 06:55:41 <-- Viewing This Message
, Thu, 12 Mar 2015 07:47:56
, Mon, 9 Mar 2015 10:44:46, Mon, 9 Mar 2015 10:00:02, Mon, 9 Mar 2015 09:28:41
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