I plan on running hooker longtubes on my 99 Z28 A4 and I was wondering if I needed o2 extensions for both the passenger side and the drivers side? Will the SES light come on if I choose to use these? I haven't done anything internally to the engine. Also, where is the cheapest place to purchase both the extensions and the sims from? Thanks for your help with this matter.

 

i know u need them on the passenger side.. not sure bout the driver side.

/tek.

 

I don't know what extensions you'll need. You could always make your own. Just get the connecters from a parts store. Just make sure you use heat shrink to keep moisture out. I wouldn't cut the harness on my car.
I have a pair of O2 simms off my '99 for $55 to your door. I got tuning and had the codes deleted so I don't need them anymore.

 

you ll need both extensions, at summit $21.95 each, you can get 02 sims anywhere including summit if $88.95. no, the extensions will not trigger a code.