Cat problems on the A4. will s8 cats fit?

[Nj]

Just managed to get vagcom working with my A4 and got the results below.

16805 says cat bank 1
I believe 16815 is bank 2

One of the lads on audifans tells me this refers to the rear (after cat) sensors, which suggests the cats are knackered. Mr Audi dealers says £2300 for new cats and sensors and I reckon i'm still looking at near a grand if I source them elsewhere. vagparts couldn't even help me do any better than dealer prices.

Bry has kindly offered me a pair of unused S8 cats for pennies. Part number should be 4D0 131 089 X. Does anybody have a clue if these will be the same diameter as my A4 cats so that I could see about having the old ones cut out and S8 ones welded in, rather than offer up my holiest of holies to the dealer and telling them to fire away.


well actually Si (sdk778 is looking into an alternative for me so fingers crossed)

cheers
--------------------------------------------------------------------------------
VAG-COM Version: Release 409.1-US


Chassis Type: 8E - Audi A4 B6
Scan: 01,02,03,08,09,15,16,17,26,36,37,45,46,55,56,63,76

-------------------------------------------------------------------------------
Address 01: Engine
Controller: 8E0 909 559
Component: 3.0L V6/5V 0004
Coding: 0011711
Shop #: WSC 63351
2 Faults Found:
16805 - Warm Up Catalyst: Bank 1: Efficiency Below Threshold
P0421 - 001 - Upper Limit Exceeded
16815 - Shareware Version. To Decode all DTCs
P0431 - 001 - Please Register/Activate
Readiness: 0000 0000

-------------------------------------------------------------------------------
Address 03: ABS Brakes
Controller: 8E0 614 517 A
Component: ABS/ESP allrad 1726
Coding: 04495
Shop #: WSC 06435
No fault code found.

[shark_90]

Surely you wouldn't buy originals anyway? Patterned part/SS exhaust place specials?

I have no idea about the S8 cats.

[Beetie]

Bin and bypass!

[Nj]

haha. yeah I don't think mr MOT man would be overly impressed with decat pipes once per year

I don't plan on buying original replacements at that kind of price (£2300 with lambdas i think). I spoke to a guy that runs C&C custom SS exhausts in Glasgow and he reckons the s8 cats will be cool as long as they physically fit into the recesses underneath. might need adapters if the pipe diameter is a bit bigger but he thinks it should be ok to do. Looking at a ballpark £100 per side for the work.

i've somehow ended up with 2 threads running side by side now. doh!

http://www.s2forum.com/forum/showthread.php?t=32958&page=2