Slammed370

Well I went to a local shop this weekend to have my Berk HFCs installed on my Nismo but couldn't because of the "Demon Bolt". The shop tried for hours everything they could on getting this bolt out without stripping it. I also had a friend who is good with cars take a look and he spent about 2 hours on it and gave up. Not sure what to do now or where to go. This is pretty frustrating any help or shop that has experience with Zs and getting the cats out would be great. Thanks. Rich