Here are pics for your O2 Sensor Fix(Cel/Check engine light) with a test pipe if you Remove the Cat. Enjoy
Pick up a set of these i got 18mm i think 19mm will fit better for a evolution :) Remember to remove the NEGATIVE SIDE OF THE BATTERY TERMINAL BEFORE YOU START!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Gather your tool you will need a power drill and many bits i dont know the size i just measure it against the O2 sensor and pick one that was closest to it then get drill bits that are smaller and drill it out topside and underside
Use some type of gripper like this it is perfect to hold the Nut in place as your drill the hell out of it!!!!!!!!!!!!!!!!!
Look at the difference you only need to drill one of the package of two out. Look below. Put the one you drilled on top so the o2 fits in that one and the other you did not touch on the bottom
Now for the fun part mount it. Make sure you thread it in place and it fits the midpipe and the o2 Sensor. If not keep drilling to make a larger hole
Now PLACE IT IN THERE LOL!!!!!!!!!!!!!!!!!!!!!
BAM!!!! YOUR DONE. DROP THE CAR PUT THE NEGATIVE SIDE CABLE BACK IN AND CRANK THE CAR AND WATCH AS THERE IS NO CEL FOR A O2 ERROR DUE TO NO CAT. NOW YOU CAN KEEP YOUR HP GAINS. I HAVE A BOOST CONTROLLER AND FUEL PUMPING COMING IN NEXT WEEK STAY TUNED FOR THAT INSTALL
