I don't think I ever responded to your question about my drive shaft......sorry. I did replace with a 1 piece carbon composite piece. Probably one of the best mods I had spent money on for the force induction application. That piece with a lightened drive line was awesome.
Spoke with James Martin Ext 220. Good people and they stand behind their work. I hope this helps, let me know if you need anything else and keep me posted. Good luck bro!