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2009 BMW E63 M6, Sapphire Black
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Discussion Starter #1
About to undertake a full suspension rebuild (37,500 miles) The front tension struts are loose, so I figure, rear control arms are next. While I'm down there, may as well do the whole thing. Once I start tearing down, I also clean, which takes me twice as long to do the job, thought I'd get a head start while waiting for parts to arrive. Decided to clean up the exhaust yesterday. Turned out pretty nice, still have more work to do. I like a clean undercarriage, makes it easier to spot issues. Also a great way to get familiar with all the parts of your car.

One thing I noticed, is the front pipes that come off the catalytic convertors seem to be a bit different quality of stainless steel. A bit shinier and smoother. Forgot to take a photo of them.

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Think front pipes are T304 and the rest are T409.

The fronts are also double walled up to the secondary cats.

Very nice though, satisfying.


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2009 BMW E63 M6, Sapphire Black
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Discussion Starter #4
Think front pipes are T304 and the rest are T409. The fronts are also double walled up to the secondary cats.
Yes, they did seem thicker. Thanks for the insight.
 

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2009 BMW E63 M6, Sapphire Black
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Discussion Starter #6
cool ! I'd guess it's done to keep the heat/noise down?
 

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2009 BMW E63 M6, Sapphire Black
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Discussion Starter #8
Duragloss 853 Aluminum wheel cleaner - just don't get any on your bolts/nuts or other hardware that has zinc - I think it reacts with the zinc. stainless steel/copper seems to be OK.
 
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