Coolant Leakage Solved- BUT now BOOST

Bernie Benz b.benz at
Thu Aug 4 19:51:59 EDT 2005

> From: Phil and Judy Rose <pjrose at>
> At 9:02 AM -0700 8/4/05, Bernie Benz wrote:
>>> From: Taka Mizutani <t44tqtro at>
>>> Bernie-
>>> Isn't the stock system stainless? I never checked to see if it was
>>> magnetic or not, but the piping definitely looked like stainless.
>> I don't believe so, just well protected mild steel.  They do rust out, I'm
>> on #2.
> Bernie,
> Taka is correct, as certainly the stock Audi exhaust pipes are
> stainless and it's  widely accepted as fact (except possibly by you)
> that the exhaust system is predominately made of stainless steel
> components. I'm surprised that you think that "well protected mild
> steel" could survive 15 rust-belt winters (both my '91 200q cars
> still have their original exhaust systems, although some muffler
> perforation has occurred). Even stainless steel cannot avoid eventual
> corrosion by calcium chloride.
Painless Stainless comes in all degrees of corrosion resistance under high
temp exhaust conditions.  Only the austenitic (high chrom/nickel) alloys are
non or only slightly magnetic.

Using the magnetic test,
the down and back pipes are nonmagnetic.
The cat's outer skin is magnetic, as is that of both mufflers.
The intermediate and rear piping are also magnetic.

CaCO4?  I've not seen an exhaust system deteriate, loose its functional
effectiveness, from outside contaminates, always corrosion from the inside


> Phil
> -- 
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> *  Phil & Judy Rose           Rochester, NY  *
> *        mailto:pjrose at       *
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