1998 Audi A4 1.8T quattro manual with mods.

The new test pipe now arrived, and we are ready to install it.

A Milltek Audi A4 B5 Full Cat Back Exhaust is already on.

Can someone provide links to detailed instructions or posts how to do it?

Thanks.

This is the test pipe we have.

http://www.ecodetuning.com/shop/cart...t_detail&p=671

ATP Audi A4/Passat (B5) 3" Cat delete Racing Downpipe

Was: $165.00
Now: $145.00
SKU: ATP-VVW-138

Fits 1997 - 2001 Audi A4/Vw Passat with K03, K04, or ATP Elminiator Series Turbos 3" racing downpipe deletes restictive cat immiediately after the turbo on the longitudinally mounted 1.8T. There is no welding or cutting necessary. The downpipe has a large 3" opening to take full advantage of the turbo flow and has provisions for the factory oxygen sensors. Typical gain is 200 to 400 rpm sooner spoolup and 40 ft/lb of wheel torque. HP gain is 10-15 on stock and K04 turbo and 30-40 on GT28RS or larger turbo. Our favorite when used with stock exhaust for ultra quite stealth sound. This part is for offroad use only.

 

its not that hard, its 6 bolts and 2 sensors to move, you remove the 3 bolts between the cat and exhaust, which shouldnt be hard since you recently removed them to put the exhaust system on so they wont be rusted on there.

remove the turbo to cat bolts (3). remove the cat, install the test pipe in its place. move your O2 sensors to the test pipe. make sure you get them in the correct order. you may get a CEL from doing this, in which case you need a spacer for the after-cat O2 sensor.

 

What IS the correct order for the oxygen sensors?
Brown before or after the cat?
Black?

While we have them out: how can we check if the sensors are in good working order?

Volker

 

Installation done. CEL on as expected. Have spacer ("non foulers"), 2 long and 2 short. What is the most likely combination of spacer to eliminate the CEL? Are the spacers needed only for the downstream sensor?