S4 vs s6 exhaust manifolds

[bluequattro]

So one with welded seams was from s4, one without was from s6 auto
Different size pipes and longer turbo section on s6
Any particular reasons for the design differences?
One flow better than other?
Diameter at head sides are same for each one

[bluequattro]

Another photo

Side comparison shows different length to turbo
S6 one has no part numbers whereas s4 one does

[Ruffiano]

the one on the right is an RS2 manifold.

[bluequattro]

Ill be taking it off eBay then. Lol

[Ruffiano]

Yeah i almost 'bought it now' saw it a couple days ago mislisted.

[bluequattro]

Why no part numbers?
Ill save it with my rs2 injectors, turbo and ecu then until I find an inlet manifold

[hunker7]

eBay knock off maybe, so no problem PN?

[bluequattro]

That's what puzzled me having no numbers which is why I posted photos
Seems well made and nice casting
May as well keep it now

[UrS4boy]

OE 3B, AAN, ABY and ADU Exhaust Components: a consolidation of info.

So one with welded seams was from s4, one without was from s6 auto

Neither of them have welded seams. Its all just casting marks. As suggested the one on the right is an RS2 or RS2 clone manifold.

OE 3B, AAN, ABY and ADU Exhaust Components: a consolidation of info:
http://forums.quattroworld.com/s4s6/msgs/196904.phtml

RS2 manifold on the top. 3B, AAN (UrS4 and UrS6), and ABY manifold on the bottom (Note how cylinders 1 and 5 are handled in the two different examples):

[andy10v]

Looks like an RS2 rep, no casting lines.

[quattro-nick]

the right one is probably a replica rs2 manifold,i"v sold one to andy in the past
but there are many replica's on ebay,different brands,mine came from arlows

https://www.arlows.de/Exhaust-manifo...0dgndjhsqictf5

[andy10v]

You can get ebay ones for £89.99 now

http://www.ebay.co.uk/itm/AUDI-RS2-K...0AAOxyYANTX5Nb

[s2coupe3b]

looks like a wagner evo copy for me on the right.