[Ryphex]

So I am installing an M4 Gp 19 exhaust onto my ZX6R. I got everything pretty much ready and the last thing I need to do before slipping on the exhaust is taking off the pre chamber. Only issue is I noticed the top torx bolt was a little stripped. I gave it a shot none the less and long story short after 9 hours I've really jacked up this bolt. It's on their so damn tight. I've tried bolt and screw extractors. I've tried using an impact gun. I feel like I've tried everything. Does anyone have any more suggestions?