I BOUGHT SOME STEEDA MILS FOR MY OFF-ROAD H-PIPE, MY CHECK ENGINE LIGHT WAS ON BECAUSE OF IT. HOW DO I INSTALL THEM?? I INSTALLED RIGHT BEFORE THE O2 SENSOR. I DISCONNECTED MY BATTERY FOR 30 MINS PUT ON THE MILS HOOKED UP MY BATTERY THEN I TOOK IT FOR A RIDE. CHECK ENGINE LIGHT CAME ON LIKE 20 MINS LATER. WHAT'S UP??!!