well i replaced my o2 sensor today...the o2 sensor is listed for $153 but my dad got it for 103 thru work. everything installls fine except the wires dont give enough slack to plug the harness back into the mount after connecting...this can be fixed by zip tying it to the mount....one thing i noticed is how tiny the runners are on the header, like holy restrictiveness...cant wait til i get the new header on there because there has to be an improvement with how small the stock one is