looking at my service manual (z33 2003) It shows 4 o2 sensors. Bank 1 sensor 1, bank1 sensor 2, bank 2 sensor 1 and bank2 sensor 2. Say that 5 times fast.
All the pics I see of the APS test pipes only show one bung hole per TP.
Do you not install the o2 sensors located behind the stock cats because it would be a useless redundant sensor?
If this is the case, will you have a constant check engine light becouse the system will be looking for data from these sensors?
And I know the car won't pass emissions with the TP's installed, but could you put the cats back on when you have to get the car inspected, without any problems?

Thanks

 

but the test pipes. Then buy Non foulers to fool the ECU in to thinking u have cats. If your still hesitant spend a bit more and get ART pipes and b done with it

 

Do I need to cut a second bung hole in each TP for the other 2 o2 sensors, and use the non foulers on these 2 o2S?

 

i only have 2 o2s. I have only ever had 2

 

This is the parts listing from my service manual.

1. Heated oxygen sensor 2 (bank 1) 2. Three way catalyst (RH bank) 3. Gasket
4. Heated oxygen sensor 1 (bank 1) 5. Exhaust manifold cover (RH bank) 6. Exhaust manifold (RH bank)
7. Exhaust manifold (LH bank) 8. Exhaust manifold cover (LH bank) 9. Three way catalyst (LH bank)
10. Heated oxygen sensor 1 (bank 2) 11. Heated oxygen sensor 2 (bank 2)

 

im not to literate with the service manual or what u just posted lol. But im pretty sure we only have 4 02s. Headers/cats

 

I hope this comes out but hear is the diagram

 

Your previous post you stated you only have 2 o2's

 

I got it. Stupid Me. after studying the pic longer two of the o2s are located in the manifold. the other o2's are in the cats.

 

sorry for the right but not word right info. that was suppose to mean i have only TWO o2s in my cats. No worries. GL with ur tps