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<center><img src="http://pictureposter.audiworld.com/54666/testpipe_teaser.jpg"></center><p>
those running gutted cats or testpipes with non foulers. what setup are you exactly running?

Since there are different kinds of non foulers:

Short 18mm ones and Long 18mm ones. The short ones wont even accept the 02 sensor unless those are drilled out. The long foulers will accept the 02 sensor to a certain extend but wont thread all the way into the fouler.

Question now is: how are your foulers stacked?

SN = short fouler non drilled
SD = short fouler drilled
LN = long fouler non drilled
LD = long fouler drilled
02 = 02 sensor
TP = testpipe
code = errors saved
cel = Check engine light illuminated

also state your year and engine code

02 | LD | SN | testpipe | 00 atw = CEL
02 | LD | 00 atw = CEL
02 | LN | 00 atw = CEL
this would be my response as of today
02 | TP | 00 atw = CEL

leosphere

02 | LN | LN | Testpipe '00 ATW code... I plan on drilling it, soon (edited)

Ray Khan

they didn't work for me, back to a CAT ATW

Justin517

O2 - SD - SN - TP..... 1997 AEB....No codes ever, its been 8 months.

j31izzle

02 | SN | SN | testpipe | 00 atw = code

bitjockey (bum)

O2 | SD | SD | testpipe | AEB = no code ever

leosphere

We need another way to trick the ecu.

AudiVT2000

The CEL is sporadic and will go away after 50 or so miles of driving with it on. However my friend who also has a DBW car-but a 2001 does not get a CEL and has the exact same setup.

andysprague

O2 l SD l SN l gutted cat l '98.5 AEB l no code

leosphere

unless I didn't check well enough.