Originally Posted by IsFast3r

I went through this when I recently did my PPE headers a few weeks ago. The gaskets you have circled are correct 17173 and 17173a (they are actually the same gaskets left and right). Remember to use your CL discount if buying from sewell.

Gasket 17410B I did not get and I do not think is necessary as lowrideraz said. The sensors are on the oem headers and for whatever reason is not shown in the diagram above. If you look at the ppe headers you will see a open slot for the o2 sensors. Since I bought them new the installers didn't bother to try to remove the old ones, so they are still on the oem headers.

What I found a lil odd was that the gaskets 17173 were like a composite looking plastic whereas the installer game me back the oem gaskets and they were metal. Anyone else that had this done notice this?

Good luck OP! Your gunna love it

Originally Posted by lowrideraz

Actually The Simulator, there is only one, Connects from above the the ECU wire connectors under a flip open box under the hood. It is installed from above, and complete instructions come with the headers. Once installed, unless you know what your looking for, the installation is invisible.

Lou

Originally Posted by mr2envi

Mine was modified to tap into the two downstream o2 sensors. More simpler installation because of no stripping or clipping of the ecu harness. No code so far