| is the challenge, but I can get to all of these from underneath w/ just basic tools: 13mm shorty wrench - for top bolt closer to driver side - for bottom nut closer to center of Z 13mm regular length wrench - for bottom nut closer to driver side 13mm 1/4" socket w/ u-joint and extensions - for top bolt closer to center of Z O2 sensor tool from Pep Boys ($10) - remove once on vise, tough to remove installed in Z Anti-sieze/PB Blaster- do as Nixit says. If the bolts don't give, don't use crazy force or they will break and then you'll be in for a real PIA of a job. Just be patient w/ the PB Blaster- could take a day or 2 of soaking to penetrate enough to prevent broken bolts and studs.
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