b5 s4 and c5 a6

[agentblack]

im looking into the differences,,,,, like if the c5 2.8 liter is interchangeable with the b5 2.7 tt they seem the same with only different bore size but i'm looking for answers

also looking to see if one can that the b5 exhaust manifold and use it to twin turbo the c5 2.8 liter

[Stockblacka6]

There is a conversation already going on about this on the two different engines. Unless you already have a 2.8 A6 I would suggest just looking into purchasing a 2.7. I am sure you can find one reasonably close in price. Good luck.

http://www.audizine.com/forum/showthread.php?t=251487