Does anyone know what size the stock piece of flexpipe is for a 99.5 A4? I did a search and some thought it was 2 inch but did not know for sure. Also is it stainless steel? Mine has a hole in it and saw the ecs has replacements but they are all stainless

Here is the one I was looking at:

Universal Flex Section (2"x4")-Priced Each ES#3540
Stainless steel flex section that measures 2" IDx4" length $34.95

 

Yes it is 2" I just replaced mine last weekend. If it is stainless is a very poor one, mine was extremely rusted. I dont beleive the stock is stainless and its very heavy compaired to the Borla exhaust I just installed.

 

You can replace a non stainless pipe with stainless. That way it wont rust another hole in it. Not exactly sure but i think its right around 2 inches.