Stripped nut on exhaust manifold need help!!

[jlmillionaire]

Hi all , I was attempting to remove my oem exhaust manifold on sr20det to inspect then sell my turbo. I managed to remove all nuts with ease the lb come to realize that one of the ones in the middle is stripped rounded out. I will upload a photo of the specific nut in a few. At this point I've tried almost every method I could think of. I'm looking for some advice of what to do in sure the fellow zilvians that have encountered the same issue thanks guys.