less expensive place to get a new expansion tank, other than ECS?
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#10
carmadillo.com - get the one for a regular A4 (part no has "L" suffix) The S4 one w/"M" suffix
costs like $25 more and the only difference is a heat shield and drain hose that you can re-use from your old tank. STFA for my prior posts on this if you want the full part no.