First go to napa and tell them you need 18 mm spark plug non foulers (they used these in old cars that had oil problems or sumtin) They will give you two in a pack there are a little piece of metal. In one side there is a large hole that is whre the o2 sensor goes down into on the other side there is a smaller hole this part is where you do a little modification. If you have a vise put it in there with the smaller hole facing up. You could use a drill press but not to many people have those. If you have a drill it doesn't matter what voltage it won't take alot of power. Get a half inch drill bit and drill through it this allows the tip of the o2 sensor to go through the spark plug non fouler. If you must you can start with smaller bits then work up to half inch. Simply screw these into the rear o2 sensor holes of the pipe. This sets the o2 sensor farther away from the exauhst gases so the computer doesn't sense as much fumes and will not triger the check engine
light. If it is still on try getting another set of these and do the same process and screw one on top of the other. I did this in the begining of summer and have an o/r bbk xpipe and have not had the engine light come on once.